New-York tribune., 1874-11-09
ON THE NEWPORT CON-
GLOAfERATE.
By Prof WHltdm u. Rogers

Prof. Rogers began by referring to the inter-
sug paper on the structure these rocks read by the
late dlstin shed geologis Prof. Hitchcock Of Amherst,
nc the meeting OF American Scientific Association In
1900 In this communication Prof HITCHCOCK sus8ested
that the generally elongated form aud closely AsunR
OF the pebbles due to n1nse ana long
continued pressure under which pebbles we're squeezed
out as # In q semi-pastc condition. II THIS view FrOi'
Rogers objected at the time, maintaining that the
forms of the pebbles only the result
of the wearing action 10 which the fragments
had been originally subjected In the process
of their deposition and accumulation Al suosequeh1
meeting OF the Association 1869 tho theory OF Prof.
Hitchcock again brought forward ani an arSuhenI
i'm lts favor was irawn by Prof. VIM B!akc from te
experiments Of Prof Trcsca on wlit that pllOsopuer
ma called the DOW OF solids" In these experiments
i'm ali coses the solids subjected to The mOding 0rce eX
hbted strlkIns alteration OF internal structures ths
bar OF metal iOrced through cOhIracteu openins
so IA 70 bo reduced in diameter presented alter thS
change series OF conceutrc. l00p-ke curves nlarlhg
fhe reIative notion OF the different parts. supposng
that the ps bbles hatened and lengthened H.
of form could not fail be accompanied by some analo
gOus change Of structure superlniiced oy ne
mi as the pressing force must bo concelved 10 nave
peryaded the rock generally ID some speelHc
or directions. 1t was to be expected d1a, ade @
laminaiion other structure wOun oe iouAi 'e Sae
IN all the pebbles making up the mas. ,t, Dr.,
On a careful examination, however, whicn frul'
c,na exposures OF the Newport eOnglOmerae, ne hid
met with no evidence tnat there hai oeeh any sucu
nna
es s!nce their first accumulation As these are oF he
most part rolled fragments or SANDSTONE qurZt nhu
silicious states, having more or less lamlnaHOn au
onnortunity is frequently presented on IAo rmootn
face OF the rock for studying their Internal IRE
IA an Illustration of how entirely independent ths
strcture is OF the supposed moldiaS iorcc he exlDe
10 the Academy a tracing or tne con21otperdte sur
face on transparent paper, on whlen WHO iaIu
npOn the rock he mad drawn the OUTLINES Oh Ihe oc'ot
pebbles with direction Of the observer Al
s diagram II was seen that the laninaton hid every
variety of direction aud that II extenleu ehtcy cos
each pebble, leaving no room Ior supposiHs sven q
snnertca al muldng effect from pressure lac pIeuoI-
OF the lamiu. as might be e1peeee COLI
forms to the general direction OF tue usually long ana
atsh and therefore 70 tho strike OF the OecS
bnt even in cases where this conformity Is nost preVa
ent and the pearance OF natenlng Dy pressure most
marked pebbles arc interspersed IL whlch the hua-
uon has various transverse oireouons no' unnoo @
auentv at right angles 70 tho strike. SipP0s,
ing IL possible for the lamlDauon pualei
TO the strike 10 been caused by pressure IL Is ~
that scattered PEBBLES referfeu 10 cOu
faye escaped the general efecI or cOuu pIeseut "
nationln such different directions II wouid seem ter
fore in view of these facts, tna there nothing IN e
structure or Newport conglomerale Gaming LUZ any
further agency than the ordinary ransportIue nuu
wearing actions under which such masses unVe sehet
ally been accumuia ed. Prof. Rogers next spohe VI
the d,acntv encountered IN many In detern,n-
ing the DIP OF these cODSomerate Dru OWING W lnc
tact that frequently the poDbles forming ne Deu iu
stead of living their longer sections parae 70 the
planes OF bedding, placed partly 70 luese
OF Large ne bibles beaches at the present day BY
tracipg the beds OF sandstone occurring occas0uay III
the deposit II was, however, geueraiy pOssiDe 10 ue
termIns the dip. lie had discovered casts OF what
glomerate Analogous which ne exhibited TO the
in ls0 from the Fai RIVER congUmerae III
which they had been found by the late Mr. Norman
Eastou Of that city.