TABLE 1. Conodont data from Ordovician samples from the subsurface of
Pennsylvania.

+-----+------+-------+---+---------------+----------+---+-----------+
| COU | WELL | STR   | C | #             | AGE      | C | REMARKS   |
| NTY | N    | ATIGR | O |               | RANGE OF | A |           |
|     | AME; | APHIC | R | #             | C        | I |           |
| API |      | UNIT  | E |               | ONODONTS |   |           |
| n   | FOO  |       | ? | # C           |          |   |           |
| umb | TAGE | (     |   | ONODONT FAUNA |          |   |           |
| er[ |      | Based | O |               |          |   |           |
| ^1] | (    | on    | R |               |          |   |           |
|     | Lati | picks | C |               |          |   |           |
| U   | tude |       | U |               |          |   |           |
| SGS | No   | pro   | T |               |          |   |           |
| C   | rth/ | vided | T |               |          |   |           |
| oll |      | by    | I |               |          |   |           |
| ect | L    | the   | N |               |          |   |           |
| ion | ongi |       | G |               |          |   |           |
| Num | tude | Pe    | S |               |          |   |           |
| ber | W    | nnsyl |   |               |          |   |           |
|     | est) | vania |   |               |          |   |           |
|     |      | Depar |   |               |          |   |           |
|     |      | tment |   |               |          |   |           |
|     |      | of    |   |               |          |   |           |
|     |      | Na    |   |               |          |   |           |
|     |      | tural |   |               |          |   |           |
|     |      | Resou |   |               |          |   |           |
|     |      | rces) |   |               |          |   |           |
+=====+======+=======+===+===============+==========+===+===========+
| Arm | No.  | Black | c | 1 *Phragmodus | Middle   | 4 | 2.1 g of  |
| str | 1    | River | u | inflexus*     | Ord      | - | rock      |
| ong | Ne   |       | t | Stauffer; P   | ovician; | 4 | processed |
|     | llie |       | t | element       | *C.      | . | (trace of |
| 005 | Mar  |       | i |               | sweeti*  | 5 | insoluble |
| -21 | tin; |       | n | 1 unassigned  | -*P.     |   | residue   |
| 201 |      |       | g | o             | undatus* |   | remained) |
|     | 122  |       | s | istodontiform | Zone     |   |           |
| 11  | 80-1 |       |   | element       | (late    |   |           |
| 911 | 2400 |       |   |               | Chazyan  |   |           |
| -CO |      |       |   | 2             | to       |   |           |
|     | 4    |       |   | indeterminate | Rock     |   |           |
|     | 0.88 |       |   | fragments     | landian) |   |           |
|     | 483/ |       |   |               |          |   |           |
|     |      |       |   |               |          |   |           |
|     | -    |       |   |               |          |   |           |
|     | 79.3 |       |   |               |          |   |           |
|     | 4708 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| B   | Mary | Tr    | c | BARREN        | Not      | n | 106 g     |
| edf | Mar  | enton | u |               | de       | / | rock      |
| ord | tin; |       | t |               | termined | a | processed |
|     |      |       | t |               |          |   | (37.8 g   |
| 009 | 1    |       | i |               |          |   | +20-mesh, |
| -20 | 490- |       | n |               |          |   | and 8 g   |
| 013 | 1700 |       | g |               |          |   | 20-200    |
|     |      |       | s |               |          |   | mesh      |
| no  | 3    |       |   |               |          |   | insoluble |
| U   | 9.94 |       |   |               |          |   | residue   |
| SGS | 557/ |       |   |               |          |   |           |
| co  |      |       |   |               |          |   |           |
| lln | -    |       |   |               |          |   |           |
| \#  | 78.6 |       |   |               |          |   |           |
|     | 0438 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| B   | Je   | Tr    | c | BARREN        | Not      | n | 117.1 g   |
| edf | ssie | enton | u |               | de       | / | rock      |
| ord | Mil  |       | t |               | termined | a | processed |
|     | ler; |       | t |               |          |   | (22.9 g   |
| 009 |      |       | i |               |          |   | +20-mesh, |
| -90 | 7    |       | n |               |          |   | and 6 g   |
| 002 | 913- |       | g |               |          |   | 20-200    |
|     | 8130 |       | s |               |          |   | mesh      |
| no  |      |       |   |               |          |   | insoluble |
| U   | 4    |       |   |               |          |   | residue   |
| SGS | 0.10 |       |   |               |          |   |           |
| co  | 688/ |       |   |               |          |   |           |
| lln |      |       |   |               |          |   |           |
| \#  | -    |       |   |               |          |   |           |
|     | 78.6 |       |   |               |          |   |           |
|     | 1926 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| But | Hock | Tr    | c | 2 fragments   | Middle   | 2 | 105.3 g   |
| ler | enbe | enton | u | of coniform   | or Late  | - | rock      |
|     | rry; | &     | t | elements;     | Or       | 3 | processed |
| 019 | 8    | Black | t | indet. to     | dovician |   | (12.6 g   |
| -90 | 812- | River | i | gen. & sp.    |          |   | +20-mesh, |
| 063 | 9202 |       | n |               |          |   | and 2 g   |
|     |      |       | g |               |          |   | 20-200    |
| 11  | 4    |       | s |               |          |   | mesh      |
| 912 | 1.10 |       |   |               |          |   | insoluble |
| -CO | 660/ |       |   |               |          |   | residue)  |
|     |      |       |   |               |          |   |           |
|     | -    |       |   |               |          |   |           |
|     | 80.0 |       |   |               |          |   |           |
|     | 4028 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Cen | L    | Tr    | c | 1             | Middle   | 4 | 117.1 g   |
| tre | ong; | enton | u | *Ps           | or Late  | . | rock      |
|     |      |       | t | eudooneotodus | Or       | 5 | processed |
| 027 | 1    |       | t | mitratus*     | dovician |   | (34.2 g   |
| -20 | 4,85 |       | i | (Moskalenko)  |          |   | +20-mesh, |
| 001 | 0-14 |       | n | element, with |          |   | and 6 g   |
|     | ,960 |       | g | basal         |          |   | 20-200    |
| 11  |      |       | s | \"funnel\"    |          |   | mesh      |
| 913 | 4    |       |   | attached      |          |   | insoluble |
| -CO | 0.99 |       |   |               |          |   | residue). |
|     | 410/ |       |   | 1 unassigned  |          |   | One       |
|     |      |       |   | o             |          |   | fragment  |
|     | -    |       |   | istodontiform |          |   | of a      |
|     | 77.6 |       |   | element       |          |   | hind      |
|     | 0144 |       |   |               |          |   | eodelloid |
|     |      |       |   | 1 indet.      |          |   | element   |
|     |      |       |   | hyaline       |          |   | fragment  |
|     |      |       |   | element       |          |   | in this   |
|     |      |       |   | process       |          |   | sample,   |
|     |      |       |   | fragment      |          |   | w         |
|     |      |       |   |               |          |   | /somewhat |
|     |      |       |   | 1 indet.      |          |   | lower     |
|     |      |       |   | albid element |          |   | CAI, is   |
|     |      |       |   | fragment      |          |   | c         |
|     |      |       |   |               |          |   | onsidered |
|     |      |       |   |               |          |   | downhole  |
|     |      |       |   |               |          |   | con       |
|     |      |       |   |               |          |   | taminant. |
+-----+------+-------+---+---------------+----------+---+-----------+
| C   | No.  | Tr    | c | *Phragmodus   | late     | 4 | 118.5 g   |
| lin | 1 PA | enton | u | undatus*      | Middle   | . | rock      |
| ton | T    |       | t | Branson &     | or Late  | 5 | processed |
|     | ract |       | t | Mehl          | Ord      | - | (10.6 g   |
| 035 | 285; |       | i |               | ovician; | 5 | +20-mesh, |
| -20 |      |       | n | 2 P, 3 S, 1 M | *Ph.     |   | and 7 g   |
| 276 | 14   |       | g | elements      | undatus* |   | 20-200    |
|     | ,500 |       | s |               | Zone to  |   | mesh      |
| 11  | 0-14 |       |   | 4 indet. gen. | end of   |   | insoluble |
| 914 | ,670 |       |   | & spp.;       | Or       |   | residue). |
| -CO |      |       |   | element       | dovician |   |           |
|     | 4    |       |   | fragments     | (latest  |   |           |
|     | 1.37 |       |   |               | Blac     |   |           |
|     | 129/ |       |   | 4 indet.      | kriveran |   |           |
|     |      |       |   | fragments.    | to       |   |           |
|     | -    |       |   |               | latest   |   |           |
|     | 77.5 |       |   |               | Ga       |   |           |
|     | 6662 |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Cr  | Kard | Tr    | c | 2 *Belodina   | late,    | 1 | 110 g     |
| awf | osh; | enton | u | compressa*    | but not  | . | rock      |
| ord |      |       | t | (Branson &    | latest,  | 5 | processed |
|     | 6    |       | t | Mehl)         | Middle   |   | (18 g     |
| 039 | 290- |       | i | elements      | Ord      |   | +20-mesh, |
| -20 | 6400 |       | n |               | ovician; |   | and 2 g   |
| 007 |      |       | g | 1 *Panderodus | *Ph.     |   | 20-200    |
|     | 4    |       | s | gracilis*     | undatus* |   | mesh      |
| 11  | 1.71 |       |   | (Branson &    | Zone to  |   | insoluble |
| 915 | 556/ |       |   | Mehl) element | lowest   |   | residue). |
| -CO |      |       |   |               | *B.      |   |           |
|     | -    |       |   | 2             | co       |   | Sample    |
|     | 80.3 |       |   | *Panderodus*  | nfluens* |   | contains  |
|     | 0705 |       |   | sp. elements  | Zone (=  |   | about 20  |
|     |      |       |   |               | latest   |   | fish      |
|     |      |       |   | *Phragmodus   | Blackr   |   | f         |
|     |      |       |   | undatus*      | iveran - |   | ragments. |
|     |      |       |   | Branson &     | middle   |   |           |
|     |      |       |   | Mehl          | She      |   |           |
|     |      |       |   |               | rmanian) |   |           |
|     |      |       |   | 4 P, 7 S      |          |   |           |
|     |      |       |   | elements      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1             |          |   |           |
|     |      |       |   | *Pol          |          |   |           |
|     |      |       |   | yplacognathus |          |   |           |
|     |      |       |   | ramosus*      |          |   |           |
|     |      |       |   | Stauffer      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 2             |          |   |           |
|     |      |       |   | *Poly         |          |   |           |
|     |      |       |   | placognathus* |          |   |           |
|     |      |       |   | or            |          |   |           |
|     |      |       |   | *C            |          |   |           |
|     |      |       |   | ahabagnathus* |          |   |           |
|     |      |       |   | sp. element   |          |   |           |
|     |      |       |   | fragments     |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet. gen. |          |   |           |
|     |      |       |   | & sp.         |          |   |           |
|     |      |       |   | fragment      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 4 indet.      |          |   |           |
|     |      |       |   | conodont      |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| E   | PA   | Tr    | c | 2 *Panderodus | Middle   | 1 | 116 g     |
| rie | Fo   | enton | u | gracilis*     | or Late  | . | rock      |
|     | rest | &     | t | (Branson &    | Ord      | 5 | processed |
| 049 | &    | Black | t | Mehl)         | ovician; | - | (28.5 g   |
| -20 | Wa   | River | i | elements      | *C.      | 2 | +20-mesh, |
| 040 | ters |       | n |               | f        |   | and 2 g   |
|     | B    |       | g | 1 unassigned  | riendsvi |   | 20-200    |
| 11  | lock |       | s | o             | llensis* |   | mesh      |
| 916 | 1;   |       |   | istodontiform | Zone to  |   | insoluble |
| -CO |      |       |   | (M) element   | end of   |   | residue). |
|     | 4    |       |   |               | Or       |   |           |
|     | 291- |       |   | 7 indet.      | dovician |   | One       |
|     | 4756 |       |   | conodont      | (Chazyan |   | po        |
|     |      |       |   | fragments     | to       |   | lygnathid |
|     | 4    |       |   |               | latest   |   | P element |
|     | 2.01 |       |   |               | Ga       |   | fragment  |
|     | 422/ |       |   |               | machian) |   | in this   |
|     |      |       |   |               |          |   | sample,   |
|     | -    |       |   |               |          |   | w/CAI of  |
|     | 80.4 |       |   |               |          |   | 1.5, is   |
|     | 4298 |       |   |               |          |   | c         |
|     |      |       |   |               |          |   | onsidered |
|     |      |       |   |               |          |   | most      |
|     |      |       |   |               |          |   | likely    |
|     |      |       |   |               |          |   | downhole  |
|     |      |       |   |               |          |   | con       |
|     |      |       |   |               |          |   | taminant. |
+-----+------+-------+---+---------------+----------+---+-----------+
| E   | PA   | Tr    | c | 1 *Belodina   | late,    | 1 | 112 g     |
| rie | Fo   | enton | u | compressa*    | but not  | . | rock      |
|     | rest |       | t | (Branson &    | latest,  | 5 | processed |
| 049 | &    |       | t | Mehl) element | Middle   |   | (1 g      |
| -20 | Wa   |       | i |               | Ord      |   | 20-200    |
| 049 | ters |       | n | 2             | ovician; |   | mesh      |
|     | B    |       | g | *D            | *Ph.     |   | insoluble |
| 11  | lock |       | s | repanoistodus | undatus* |   | residue). |
| 917 | 2;   |       |   | suberectus*   | Zone to  |   |           |
| -CO |      |       |   | (Branson &    | lowest   |   | Sample    |
|     | 4    |       |   | Mehl) ;       | *B.      |   | contains  |
|     | 181- |       |   | dre           | co       |   | about 9   |
|     | 4308 |       |   | panodontiform | nfluens* |   | fish      |
|     |      |       |   | elements      | Zone (=  |   | f         |
|     | 4    |       |   |               | latest   |   | ragments. |
|     | 2.25 |       |   | *Phragmodus   | Blackr   |   |           |
|     | 160/ |       |   | undatus*      | iveran - |   |           |
|     |      |       |   | Branson &     | middle   |   |           |
|     | -    |       |   | Mehl          | She      |   |           |
|     | 79.9 |       |   |               | rmanian) |   |           |
|     | 1120 |       |   | 2 P, 2 S, 1 M |          |   |           |
|     |      |       |   | elements      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1             |          |   |           |
|     |      |       |   | *\"Oistodus\" |          |   |           |
|     |      |       |   | ps            |          |   |           |
|     |      |       |   | eudoabundans* |          |   |           |
|     |      |       |   | Schopf        |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 unassigned  |          |   |           |
|     |      |       |   | coniform      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | coniform      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | conodont      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragment      |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Fr  | #2   | Tr    | c | BARREN        | Not      | n | 120 g     |
| ank | Amer | enton | u |               | de       | / | rock      |
| lin | ile; |       | t |               | termined | a | processed |
|     |      |       | t |               |          |   | (20 g     |
| 055 | 1    |       | i |               |          |   | +20-mesh, |
| -90 | 478- |       | n |               |          |   | and 8 g   |
| 000 | 1598 |       | g |               |          |   | 20-200    |
|     |      |       | s |               |          |   | mesh      |
| no  | 4    |       |   |               |          |   | insoluble |
| U   | 0.18 |       |   |               |          |   | residue). |
| SGS | 459/ |       |   |               |          |   |           |
| co  |      |       |   |               |          |   |           |
| lln | -    |       |   |               |          |   |           |
| \#  | 77.6 |       |   |               |          |   |           |
|     | 7705 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| J   | S    | Tr    | c | 1             | Middle   | 4 | 108 g     |
| uni | hade | enton | u | *Dre          | or Late  |   | rock      |
| ata | Mt.; |       | t | panoistodus*? | Ord      |   | processed |
|     |      |       | t | sp. indet.;   | ovician; |   | (16 g     |
| 067 | 3    |       | i | dre           | *His     |   | +20-mesh, |
| -20 | 870- |       | n | panodontiform | tiodella |   | and 2 g   |
| 001 | 3970 |       | g | element       | holo     |   | 20-200    |
|     |      |       | s | fragment      | dentata* |   | mesh      |
| 11  | 4    |       |   |               | Zone to  |   | insoluble |
| 918 | 0.68 |       |   | 3             | end of   |   | residue). |
| -CO | 637/ |       |   | *Phragmodus*  | Or       |   |           |
|     |      |       |   | sp. indet.; S | dovician |   |           |
|     | -772 |       |   | elements      | (late    |   |           |
|     | 8083 |       |   |               | Whit     |   |           |
|     |      |       |   | 2 indet.      | erockian |   |           |
|     |      |       |   | conodont      | to       |   |           |
|     |      |       |   | element       | latest   |   |           |
|     |      |       |   | fragments     | Ga       |   |           |
|     |      |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| McK | Say; | Tre   | c | 1 *Panderodus | Middle   | 2 | 220.1 g   |
| ean |      | nton/ | u | gracilis*     | or Late  | . | rock      |
|     | 9    |       | t | (Branson &    | Ord      | 5 | processed |
| 083 | 400- | Black | t | Mehl)         | ovician; | - | (28.6 g   |
| -33 | 9590 | River | i |               | *C.      | 3 | +20-mesh, |
| 511 |      |       | n | 1             | f        |   | and 21 g  |
|     | 4    |       | g | *Panderodus*? | riendsvi |   | of 20-200 |
| 11  | 1.86 |       | s | sp. element   | llensis* |   | mesh      |
| 919 | 731/ |       |   | fragment      | Zone to  |   | insoluble |
| -CO |      |       |   |               | end      |   | residue). |
|     | -    |       |   | *Plectodina*? | Or       |   |           |
|     | 78.6 |       |   | sp. or        | dovician |   |           |
|     | 1435 |       |   | *Ap           | (Chazyan |   |           |
|     |      |       |   | helognathus*? | through  |   |           |
|     |      |       |   | sp.           | Ga       |   |           |
|     |      |       |   |               | machian) |   |           |
|     |      |       |   | 1 Sb element  |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 3 indet.      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| McK | Mi   | Tre   | c | 1             | Late     | 2 | 50.8 g    |
| ean | nard | nton/ | u | *Phragmodus*  | Middle   | . | rock      |
|     | Run  |       | t | cf. *Ph.      | or Late  | 5 | processed |
| 083 | #1   | Black | t | undatus*      | Ord      | - | (9 g      |
| -22 | M    | River | i | Branson &     | ovician; | 3 | +20-mesh, |
| 529 | oody |       | n | Mehl; S       | most     |   | and 2 g   |
|     | Lot  |       | g | element       | likely   |   | of 20-200 |
| 11  |      |       | s |               | *Ph.     |   | mesh      |
| 920 | 9    |       |   | 1             | undatus* |   | insoluble |
| -CO | 050- |       |   | *Phragmodus*  | Zone to  |   | residue). |
|     | 9480 |       |   | sp.,          | end of   |   |           |
|     |      |       |   | *Plectodina*  | Or       |   |           |
|     | 4    |       |   | sp., or       | dovician |   |           |
|     | 1.88 |       |   | *A            | (=       |   |           |
|     | 214/ |       |   | phelognathus* | latest   |   |           |
|     |      |       |   | sp.; Sc       | Blac     |   |           |
|     | -    |       |   | element       | kriveran |   |           |
|     | 78.6 |       |   | fragment      | through  |   |           |
|     | 1509 |       |   |               | Ga       |   |           |
|     |      |       |   | 3 indet.      | machian) |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | M    | Tr    | c | 1             | late,    | 1 | 159.5 g   |
| cer | cKni | enton | o | *Dapsilodus*  | but not  | . | rock      |
|     | ght; |       | r | cf. *D.       | latest,  | 5 | processed |
| 085 |      |       | e | mutatus*      | Middle   |   | (1.5 g    |
| -20 | 6844 |       |   | (Branson &    | or Late  |   | +20-mesh, |
| 004 | ft   |       |   | Mehl) element | Ord      |   | and 3 g   |
|     |      |       |   |               | ovician; |   | 20-200    |
| 11  | 4    |       |   | *Phragmodus   | *Ph.     |   | mesh      |
| 921 | 1.31 |       |   | undatus*      | undatus* |   | insoluble |
| -CO | 989/ |       |   | Branson &     | Zone to  |   | residue). |
|     |      |       |   | Mehl          | end of   |   |           |
|     | -    |       |   |               | Or       |   |           |
|     | 80.4 |       |   | 4 S, 1 M      | dovician |   |           |
|     | 6161 |       |   | elements      | (=       |   |           |
|     |      |       |   |               | latest   |   |           |
|     |      |       |   | 2 indet.      | Blackr   |   |           |
|     |      |       |   | conodont      | iveran - |   |           |
|     |      |       |   | element       | middle   |   |           |
|     |      |       |   | fragments     | She      |   |           |
|     |      |       |   |               | rmanian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | #4   | Tr    | s | 1             | Middle   | \ | 26 g rock |
| cer | Mon  | enton | i | *Eop          | to       | ~ | processed |
|     | tgom |       | d | lacognathus*? | earliest | 2 | (21 g     |
| 085 | ery; |       | e | sp. or        | Late     |   | 20-200    |
| -22 |      |       | w | *Pol          | Or       |   | mesh      |
| 421 | 8495 |       | a | yplacognathus | dovician |   | insoluble |
|     | ft   |       | l | ramosus*      | (Chazyan |   | residue). |
| 11  |      |       | l | Stauffer;     | to lower |   |           |
| 907 | 4    |       | c | distal        | part of  |   |           |
| -CO | 1.21 |       | o | process       | *B.      |   |           |
|     | 769/ |       | r | fragment      | co       |   |           |
|     |      |       | e |               | nfluens* |   |           |
|     | -    |       |   | 1             | Zone).   |   |           |
|     | 80.0 |       |   | *Erismodus*?  | A        |   |           |
|     | 4119 |       |   | sp.; distal   | ge-range |   |           |
|     |      |       |   | process       | p        |   |           |
|     |      |       |   | fragment      | artially |   |           |
|     |      |       |   |               | con      |   |           |
|     |      |       |   |               | strained |   |           |
|     |      |       |   |               | by       |   |           |
|     |      |       |   |               | un       |   |           |
|     |      |       |   |               | derlying |   |           |
|     |      |       |   |               | samples. |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | #4   | Tr    | s | 1 *Ansella*   | Middle   | 2 | 18 g rock |
| cer | Mon  | enton | i | sp. element   | Or       |   | processed |
|     | tgom |       | d |               | dovician | - | (1.5 g    |
| 085 | ery; |       | e | 1             | (late    | 2 | 20-200    |
| -22 |      |       | w | *Dr           | -Chazyan | . | mesh      |
| 421 | 8530 |       | a | epanoistodus* | to       | 5 | insoluble |
|     | ft   |       | l | sp.;          | Rock     |   | residue). |
| 11  |      |       | l | dre           | landian; |   |           |
| 908 | 4    |       | c | panodontiform | *C.      |   |           |
| -CO | 1.21 |       | o | element       | sweeti*  |   |           |
|     | 769/ |       | r |               | to *Ph.  |   |           |
|     |      |       | e | 1             | undatus* |   |           |
|     | -    |       |   | *\"Oistodus\" | Zone)    |   |           |
|     | 80.0 |       |   | venustus*     |          |   |           |
|     | 4119 |       |   | Stauffer      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 8 *Panderodus |          |   |           |
|     |      |       |   | gracilis*     |          |   |           |
|     |      |       |   | (Branson &    |          |   |           |
|     |      |       |   | Mehl)         |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | *Phragmodus   |          |   |           |
|     |      |       |   | inflexus*     |          |   |           |
|     |      |       |   | Stauffer;     |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 4 Pb elements |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | *Phragmodus   |          |   |           |
|     |      |       |   | undatus*      |          |   |           |
|     |      |       |   | Branson &     |          |   |           |
|     |      |       |   | Mehl;         |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 17 P; 34 S;   |          |   |           |
|     |      |       |   | 15 M elements |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | #4   | Tr    | s | 1             | Mid- to  | 2 | 23 g rock |
| cer | Mon  | enton | i | *Dr           | late     | - | processed |
|     | tgom |       | d | epanoistodus* | Middle   | 2 | (2.4 g    |
| 085 | ery; |       | e | sp.;          | Or       | . | 20-200    |
| -22 |      |       | w | dre           | dovician | 5 | mesh      |
| 421 | 8600 |       | a | panodontiform | (mid     |   | insoluble |
|     | ft   |       | l | element       | -Chazyan |   | residue). |
| 11  |      |       | l |               | to       |   |           |
| 909 | 4    |       | c | 4             | Rockl    |   |           |
| -CO | 1.21 |       | o | *Panderodus*  | andian). |   |           |
|     | 769/ |       | r | cf. *P.       | Age      |   |           |
|     |      |       | e | gracilis*     | con      |   |           |
|     | -    |       |   | (Branson &    | strained |   |           |
|     | 80.0 |       |   | Mehl)         | by       |   |           |
|     | 4119 |       |   |               | samples  |   |           |
|     |      |       |   | 1 genus &     | above    |   |           |
|     |      |       |   | species       | and      |   |           |
|     |      |       |   | indet.; P     | below.   |   |           |
|     |      |       |   | element frag. |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | conodont      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragment      |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | #4   | Black | s | 1 *Coleodus*? | Mid- to  | 2 | 16 g rock |
| cer | Mon  | River | i | sp.; small    | late     | . | processed |
|     | tgom | Gp.   | d | posterior     | Middle   | 5 | (15 g     |
| 085 | ery; |       | e | fragment      | Or       |   | 20-200    |
| -22 |      |       | w |               | dovician |   | mesh      |
| 421 | 9019 |       | a | 1             | (mid     |   | insoluble |
|     | ft   |       | l | *Dr           | -Chazyan |   | residue). |
| 11  |      |       | l | epanoistodus* | to       |   |           |
| 910 | 4    |       | c | cf. *D.       | Black    |   |           |
| -CO | 1.21 |       | o | angulensis*   | riveran) |   |           |
|     | 769/ |       | r | (Harris);     |          |   |           |
|     |      |       | e |               |          |   |           |
|     | -    |       |   | M element     |          |   |           |
|     | 80.0 |       |   |               |          |   |           |
|     | 4119 |       |   | 2             |          |   |           |
|     |      |       |   | *Dre          |          |   |           |
|     |      |       |   | panoistodus*? |          |   |           |
|     |      |       |   | sp.;          |          |   |           |
|     |      |       |   | fragments     |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1             |          |   |           |
|     |      |       |   | *Mic          |          |   |           |
|     |      |       |   | rozarkodina*? |          |   |           |
|     |      |       |   | sp.; P        |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 *Phragmodus |          |   |           |
|     |      |       |   | inflexus*     |          |   |           |
|     |      |       |   | Stauffer; Pa  |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | genus &       |          |   |           |
|     |      |       |   | species       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | hyaline sp.;  |          |   |           |
|     |      |       |   | distal        |          |   |           |
|     |      |       |   | process       |          |   |           |
|     |      |       |   | fragment      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 6 indet.      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Mer | M    | Tr    | c | 1             | Middle   | 2 | 119.6 g   |
| cer | aude | enton | u | *Phragmodus*  | or Late  |   | rock      |
|     | Davi |       | t | sp., cf. *Ph. | Ord      |   | processed |
| 085 | dson |       | t | undatus*      | ovician; |   | (51.1 g   |
| -90 |      |       | i | Branson &     | most     |   | +20-mesh, |
| 010 | 8    |       | n | Mehl; P       | likely   |   | and 2 g   |
|     | 220- |       | g | element       | *Ph.     |   | 20-200    |
| 11  | 8380 |       | s |               | undatus* |   | mesh      |
| 922 | ft   |       |   |               | Zone to  |   | insoluble |
| -CO |      |       |   |               | end of   |   | residue). |
|     | 4    |       |   |               | Or       |   |           |
|     | 1.27 |       |   |               | dovician |   |           |
|     | 245/ |       |   |               | (=       |   |           |
|     |      |       |   |               | latest   |   |           |
|     | -    |       |   |               | Blac     |   |           |
|     | 80.0 |       |   |               | kriveran |   |           |
|     | 1601 |       |   |               | through  |   |           |
|     |      |       |   |               | Ga       |   |           |
|     |      |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| M   | PA   | Tr    | c | 1 *Ansella*?  | Middle   | 4 | 121.8 g   |
| iff | t    | enton | u | sp.           | or Late  |   | rock      |
| lin | ract |       | t |               | Ord      |   | processed |
|     | 377  |       | t | 2             | ovician; |   | (82 g     |
| 085 |      |       | i | *Dapsilodus*? | *C.      |   | +20-mesh, |
| -20 | 5    |       | n | cf. *D.       | sweeti*  |   | and 2 g   |
| 002 | 300- |       | g | mutatus*      | Zone to  |   | 20-200    |
|     | 5390 |       | s | (Branson &    | end of   |   | mesh      |
| 11  | ft   |       |   | Mehl);        | Or       |   | insoluble |
| 923 |      |       |   | costate       | dovician |   | residue). |
| -CO | 4    |       |   | coniform      | (late    |   |           |
|     | 0.51 |       |   | elements      | Chazyan  |   |           |
|     | 161/ |       |   |               | to       |   |           |
|     |      |       |   | 1             | Ga       |   |           |
|     | -    |       |   | *D            | machian) |   |           |
|     | 77.6 |       |   | repanoistodus |          |   |           |
|     | 2851 |       |   | suberectus*   |          |   |           |
|     |      |       |   | (Branson &    |          |   |           |
|     |      |       |   | Mehl);        |          |   |           |
|     |      |       |   | ho            |          |   |           |
|     |      |       |   | mocurvatiform |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | *Phragmodus   |          |   |           |
|     |      |       |   | inflexus*     |          |   |           |
|     |      |       |   | Stauffer or   |          |   |           |
|     |      |       |   | *Ph. undatus* |          |   |           |
|     |      |       |   | Branson &     |          |   |           |
|     |      |       |   | Mehl; 1 P     |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragment; 1 M |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 2 indet.      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Pot | No.  | Tr    | c | 1             | Middle   | 4 | 120 g     |
| ter | 1 PA | enton | u | *Icriodella*  | or Late  | . | rock      |
|     | t    |       | t | sp.; Sb       | Ord      | 5 | processed |
| 105 | ract |       | t | element       | ovician; |   | (63.2 g   |
| -20 | 129  |       | i |               | most     |   | +20-mesh, |
| 182 |      |       | n | 3             | likely   |   | and 3 g   |
|     | 1    |       | g | *Phragmodus*  | *Ph.     |   | 20-200    |
| 11  | 3,60 |       | s | sp.; S        | undatus* |   | mesh      |
| 924 | 0-13 |       |   | element       | Zone to  |   | insoluble |
| -CO | ,695 |       |   | fragments     | end of   |   | residue). |
|     | ft   |       |   |               | Or       |   |           |
|     |      |       |   | 1 indet.      | dovician |   |           |
|     | 4    |       |   | element frag. | (=       |   |           |
|     | 1.48 |       |   |               | latest   |   |           |
|     | 929/ |       |   |               | Blac     |   |           |
|     |      |       |   |               | kriveran |   |           |
|     | -    |       |   |               | through  |   |           |
|     | 77.7 |       |   |               | Ga       |   |           |
|     | 7445 |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| So  | S    | Tr    | c | 3             | Middle   | 5 | Co        |
| mer | vetz | enton | u | *Phragmodus*  | or Late  |   | mpilation |
| set |      | &     | t | sp. indet. or | Ord      |   | of three  |
|     | 1    | Black | t | *Plectodina*  | ovician; |   | samples,  |
| 111 | 5,40 | River | i | sp. indet.; P | *Phr     |   | of 100 to |
| -20 | 0-15 |       | n | elements      | agmodus* |   | 200 g     |
| 045 | ,900 |       | g |               | pre-*fl  |   | each;     |
|     | ft   |       | s | 1 unassigned  | exuosus* |   | reported  |
| 1   |      |       |   | M element     | Zone to  |   | in Ryder  |
| 075 | 3    |       |   |               | end of   |   | and       |
| 0\- | 9.97 |       |   |               | Or       |   | others,   |
| -52 | 776/ |       |   |               | dovician |   | 1992      |
| -CO |      |       |   |               | (late    |   | (USGS     |
|     | -    |       |   |               | Whit     |   | Bulletin  |
|     | 79.3 |       |   |               | erockian |   | 1839-K,   |
|     | 3387 |       |   |               | to       |   | p. K7).   |
|     |      |       |   |               | latest   |   |           |
|     |      |       |   |               | Ga       |   |           |
|     |      |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Su  | Die  | Tr    | c | 1             | Middle   | 5 | 119.3 g   |
| lli | ffen | enton | u | o             | or Late  |   | rock      |
| van | bach |       | t | istodontiform | Ord      |   | processed |
|     |      |       | t | (M) element,  | ovician; |   | (53 g     |
| 113 | 1    |       | i | cf.           | *Phr     |   | +20-mesh, |
| -20 | 6,47 |       | n | *Phragmodus*  | agmodus* |   | and 7 g   |
| 002 | 0-16 |       | g | sp.           | pre-*fl  |   | 20-200    |
|     | ,610 |       | s |               | exuosus* |   | mesh      |
| 11  | ft   |       |   |               | Zone to  |   | insoluble |
| 925 |      |       |   |               | end of   |   | residue). |
| -CO | 4    |       |   |               | Or       |   |           |
|     | 1.35 |       |   |               | dovician |   |           |
|     | 469/ |       |   |               | (late    |   |           |
|     |      |       |   |               | Whit     |   |           |
|     | -    |       |   |               | erockian |   |           |
|     | 76.4 |       |   |               | to       |   |           |
|     | 6890 |       |   |               | latest   |   |           |
|     |      |       |   |               | Ga       |   |           |
|     |      |       |   |               | machian) |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| Ti  | No.  | Tr    | c | 1 *Belodina   | late     | 4 | 118.4 g   |
| oga | 1    | enton | u | compressa*    | Middle   | . | rock      |
|     | D    |       | t | (Branson &    | Ord      | 5 | processed |
| 117 | ewey |       | t | Mehl)         | ovician; |   | (16.8 g   |
| -20 |      |       | i |               | *B.      |   | +20-mesh, |
| 057 | 1    |       | n | 1             | co       |   | and 8 g   |
|     | 1,88 |       | g | *Dapsilodus*  | mpressa* |   | 20-200    |
| 11  | 0-12 |       | s | sp. or        | to *Pl.  |   | mesh      |
| 926 | ,020 |       |   | *Besselodus*  | tenuis*  |   | insoluble |
| -CO | ft   |       |   | sp.; costate  | Zone     |   | residue). |
|     |      |       |   | coniform      | (        |   |           |
|     | 4    |       |   | element       | mid-Blac |   | Heavy     |
|     | 1.68 |       |   |               | kriveran |   | -fraction |
|     | 940/ |       |   | *Phragmodus*  | to       |   | residue   |
|     |      |       |   | sp. cf. *Ph.  | mid-Sh   |   | also      |
|     | -    |       |   | undatus*      | ermanian |   | contains  |
|     | 77.5 |       |   | Branson &     | Stage)   |   | 7 fish    |
|     | 4698 |       |   | Mehl; 3 P and |          |   | fragments |
|     |      |       |   | 1 S elements  |          |   | and 1     |
|     |      |       |   |               |          |   | pho       |
|     |      |       |   | 8 indet.      |          |   | sphatized |
|     |      |       |   | conodont      |          |   | sc        |
|     |      |       |   | element       |          |   | olecodont |
|     |      |       |   | fragments     |          |   | frag.     |
+-----+------+-------+---+---------------+----------+---+-----------+
| Un  | Sol  | Tr    | c | BARREN        | Not      | n | 119.7 g   |
| ion | omon | enton | u |               | de       | / | rock      |
|     |      | &     | t |               | termined | a | processed |
| 119 | 5    | Black | t |               |          |   | (32.6 g   |
| -90 | 951- | River | i |               |          |   | +20-mesh, |
| 000 | 6273 |       | n |               |          |   | and 11 g  |
|     | ft   |       | g |               |          |   | 20-200    |
| no  |      |       | s |               |          |   | mesh      |
| U   | 4    |       |   |               |          |   | insoluble |
| SGS | 0.89 |       |   |               |          |   | residue). |
| fo  | 736/ |       |   |               |          |   |           |
| ss. |      |       |   |               |          |   |           |
| \#  | -    |       |   |               |          |   |           |
|     | 76.9 |       |   |               |          |   |           |
|     | 7566 |       |   |               |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| War | Shaw | Tr    | c | *Dr           | Middle   | 2 | 118.9 g   |
| ren |      | enton | u | epanoistodus* | Or       | . | rock      |
|     | 8    |       | t | cf. *D.       | dovician | 5 | processed |
| 123 | 333- |       | t | angulensis*   | (late    | - | (27 g     |
| -20 | 8452 |       | i | (Harris); 2   | -Chazyan | 3 | +20-mesh, |
| 150 | ft   |       | n | drep          | to       |   | and 2 g   |
|     |      |       | g | anodontiform, | Rock     |   | 20-200    |
| 11  | 4    |       | s | 1             | landian; |   | mesh      |
| 927 | 1.65 |       |   | o             | *C.      |   | insoluble |
| -CO | 390/ |       |   | istodontiform | sweeti*  |   | residue). |
|     |      |       |   | elements      | to *Ph.  |   |           |
|     | -    |       |   |               | undatus* |   | Heavy     |
|     | 79.3 |       |   | 2             | Zone)    |   | -fraction |
|     | 6919 |       |   | *\"Oistodus\" |          |   | residue   |
|     |      |       |   | venustus*     |          |   | also      |
|     |      |       |   | Stauffer      |          |   | contains  |
|     |      |       |   | elements      |          |   | 8 fish    |
|     |      |       |   |               |          |   | fragments |
|     |      |       |   | *Phragmodus   |          |   |           |
|     |      |       |   | inflexus*     |          |   |           |
|     |      |       |   | Stauffer; 1 P |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | *Phragmodus   |          |   |           |
|     |      |       |   | inflexus* or  |          |   |           |
|     |      |       |   | *Ph. undatus* |          |   |           |
|     |      |       |   | Branson &     |          |   |           |
|     |      |       |   | Mehl; 3 P, 9  |          |   |           |
|     |      |       |   | S, 6 M        |          |   |           |
|     |      |       |   | elements      |          |   |           |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 8 indet.      |          |   |           |
|     |      |       |   | conodont      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragments     |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+
| War | M    | Tr    | c | 1 *Ansella*   | Middle   | 2 | 118.5 g   |
| ren | arsh | enton | u | sp. indet.    | Ord      | - | rock      |
|     | Ch   |       | t |               | ovician; | 2 | processed |
| 123 | ilds |       | t | 1 *Belodina*  | most     | . | (24.7 g   |
| -20 |      |       | i | cf. *B.       | likely   | 5 | +20-mesh, |
| 609 | 7    |       | n | compressa*    | *B.      |   | and 5 g   |
|     | 020- |       | g | (Branson &    | co       |   | 20-200    |
| 11  | 7360 |       | s | Mehl)         | mpressa* |   | mesh      |
| 928 | ft   |       |   |               | to *Pl.  |   | insoluble |
| -CO |      |       |   | *Phragmodus*  | tenuis*  |   | residue). |
|     | 4    |       |   | sp. or        | Zone     |   |           |
|     | 1.95 |       |   | *Plectodina*  | (mid-    |   | Heavy     |
|     | 339/ |       |   | sp.; 2 P      | Blac     |   | -fraction |
|     |      |       |   | elements      | kriveran |   | residue   |
|     | -    |       |   |               | to       |   | also      |
|     | 79.2 |       |   | 1             | mid-Sh   |   | contains  |
|     | 0122 |       |   | indeterminate | ermanian |   | 4 fish    |
|     |      |       |   | (M?) element  | Stage)   |   | fragments |
|     |      |       |   |               |          |   |           |
|     |      |       |   | 1 indet.      |          |   |           |
|     |      |       |   | conodont      |          |   |           |
|     |      |       |   | element       |          |   |           |
|     |      |       |   | fragment      |          |   |           |
+-----+------+-------+---+---------------+----------+---+-----------+

[^1]: Because all samples are from Pennsylvania, the state API prefix,
    037-, was omitted for brevity.