, 1925-04-02

~ 1 AA41x o1ll 1AClAO v ait
oil and gas structures.
A section shows the area to be
overlaid with Tertiary about 100 it.
thick. 1t is a conglomerate of sand
and silt Gaping the plateau at Miller
Hill. 1t is thot that 1t may be the
equivalent of the North Park forma-
ton 1t was found to rest uncon-
formally on the lower formations.
In the Cretaceous. following form
atoms are given: Mesaverde, $500
it,; Steele shale, 1000 it.; N%iobrara,
500 IT.; Carlisle and Frontier, $50
IT,; Mowry shale, 500 it.; Cloverly,
0 IT.; Morrison, 100 TT; Red Beds
1850 it,; Embar, 800 it, Amsden,
200 to 800 it.; Madison, 100 it.
The Miller Hill-Lake Valley anti
cline is a single elongated curving
fold that plunges steeply northeast
ward and is rendered somewhat ir-
regular by domes mad terraces along
1t. The north end Of the part of the
antfcline that lies in Lake Valley is
we'll marked geographically for
about six miles by steep bluffs of
Mesaverde sandstone on its east and
west sides. but in its southern part,
where the soft Steele shale is the only
surface rock, it has no striking topo-
graphic expression. The Miller Hill
dome is a g~ravel-cOvered plateau that
stands about 1000 It. above the sur
rounding area
The Hatfield Dome
The Steele shale in Lake Valley
contains many beds OF sandstone and
hard shale, the outcrops Of which
form low hog-back ridges. The alti-
tude OF these beds, as determined by
careful surveying. indicates the pres
ence of the Hatfield dome.
Some wells were drilled for oil in
Lake Valley about 1915, but no rec
Ords OF them are available. One Of
these wells, drilled lei the lake in
section 26-20n-8Sw., rpobably in
1915, is reported to have reached
the Muddy SAM at a depth OF 4.24O
IT. In 1923 a we'll drilled on the
dome in sec. 2-19n-SSw. by F. H.
Hatfield struck gas at three horizons
and stopped in either the Muddy sand
OF the drillers or the upper part Of
the ClOverly formation at 1884. The
initial production Of gas was estimat-
ed at $1,000, 900 Gu. It. a day. The
second we'll, %one-fourth mile north
OF the first. In sec. 35-20n-SSw, was
&ohhpbcNSu III ACsr aHu Is ptODdDiy as
productive as the first. Further
drilling will be necessary to determ-
Inc the limits of the productive
area, but the structure contour lines
indicate that 1t does not extend more
than IN miles north and south and
three-fourths of u mile east and west.
On the Hatfield dome a well
should be drilled to the top Of the
Chugwatert) formation "a depth
OF about 1850 II to determine
whether the deeper sands also carry
gas or oil. The area of Steele shale.
which extends about three miles
north OF the Hatfield dome. should
be tested by deep wells drilled along
the crest OF the anticline. One OF
these wells should be drilled near the
Eh sec. 23-20n-SSw. Drilling can
be done much more cheaply In this
region now than formerly. for water
is available from the newly con-
structed main that passes from Sage
Gas for fuel is obtainable from the
wells on the Hatfield dome.
The GOOdc Terrace.
In the Goode terrace In secs. 90
i9n-SSw. 35-19n-SSw and 2-1Sn-SSw.
liz 4NIVutaih tuhl' tiopr "a
the crest OF the anticline plunges
about 400 II. to the mile. whereas
north and south OF this terrace 1t
plungcs at least 1000 II. to the mile.
Nearly all except the northern part
OF the Goodc terrace Is covered by
gravel and alluvium. and n slight
reversal OF dip or n cross fault may
exist In the area OF supposed flatten-
Ing.
The Goode we'll. drilled neal the
west line of sec. ~3i-19n-Ssw, In 1919.
reached n depth OF 1,sS5 II. and
found water In the s~o-called Wall
Creek. Muddy. and Cloverly sands
In 1924 this we'll was yielding n
strong flow OF water that contained
considerable quantities OF gas This
gas probably comes from the Muddy
rand OF the drillcrs. which was en-
countered at a depth OF LILO II. Late
in the summer OF 1924 u small drill
Ing rig was being set up about three
quarters of u milo northeast of the
doodle well near the axis OF the ter
race.
The Miller Htll Dome
The Miller Hin dome extends from
sec. 2i-i8n-S8w. south west to about
sec. S-i7n-SSw. South Of % lO-17n-
SOW, where the rocks dip rather
.stssply 10 the south . no outcrops
were examined, but = map published
BY the Geological Survey In 1910 In
dicates that the fold plungss sharply
10 the southwest in r. II n. X. 80