U.S.GEOLOGICAL SURVEYCHARLE S D. WALC OTT

DIRECTOR.OLOMMAH=SEO'

COLORADO(LAS ANIMAS CO.)

ELMORO QUADRANGLE

GENERALIZED SECTION OF THE ROCKS OF THE ELMORO QUADRANGLE.SCALE: 1000 FEET 1 INCH.

PERIOD.

NEOCENE

CRETACEOUS

FORMATION NAME.

Nussbaum formation.

Extrusive basalt.

Laramie formation.

Trinidad formation , -\ ) t t £ r;

Pierre shale.

Apishapa formation.

Timpas formation.

Carlile shale.Greenhorn limestone.Graneros shale.

Dakota sandstone.

SYMBOL.

Nn

Nb

Kl

Ktd

Kp

Ka

Kt

KcrKgn-

Kgs

Kd

COLUMNAR SECTION.

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(fejijaSMfemSytaMil

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THICKNESS IN FEET.

10-50

500

800-2500

155

1200-1300

450-500

200-250

180-200^ 30-50

200-210

300+

CHARACTBR OF ROCKS.

Sand and gravel, cemented into conglomerate at the base.

Gray to brown basalt, often vesicular. Separate flows are 30 feet or more thick.

Heavy-bedded gray sandstone, alternating with thick bands of shaly sandstone and shale containing workable coal beds.

Massive sandstone with fucoids, thin bedded at the base.

Gray and dark-colored shale, containing ferruginous limestone concretions seamed with carbonates of lime and iron.

Thin bed of limestone. Calcareous, arenaceous shale, somewhat bituminous.

Gray calcareous shale. Thin limestone beds at top and base.

Massive sandstone and dark shale.Thin-bedded limestone and shale.Gray and dark shale, containing concretions.

Gray sandstone with gray, greenish, and dark colored shales.

SECTIONS OF LOWER PORTION OF LARAMIE FORMATION FROM DIAMOND-DRILL BORINGS BETWEEN ENGLE AND GRAY CREEK.SCALE: 50 FEET 1 INCH.

HEIGHTABOVE

BASE IN FEET.

406 .

279 H

197

127

90

46

35 .

0

BORE No. 1.

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THICKNESS.

Coal in inches.

2

14

3

5 10

137

29 1048

14

5

11

Rock in feet.

127

81

42

25

1

35

1

42

346

12

10 4

CHARACTER OP ROCKS.

Sandstone and shale

Shale and sandstone.

Bony coal.

Sandstone and shale.

Shale with some sandstone.

Shale.

Massive sandstone.

Shale.

Thin-bedded sandstone and shale.

Shale. Shale.Shale.

Sandstone and shale.

Shale. Shale.

Trinidad formation. Penetrated to a depth of 60 feet 8 inches.

HEIGHTABOVE

BASE IN FEET.

413 -

355

t

218

*

141

99 .

48

30

0

BOEENo. 3.

*=>

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THICKNESS.

Coal in inches.

3

2

34

38

42

4612

40

23

Eock in feet.

20

38

72

62

75

38

45

o

14

27

2

CHARACTER OF ROCKS.

Sandstone with shale partings.

Sandstone and shale.

Sandstone.

Sandstone with a little shale.

Alternating beds of shale and sandstone.

Sandstone and sandy shale.

Massive sandstone with some shale.

T h i n - b e d d e d sandstone and shale.

Shale.

Shale and sandstone.

Shale and sandstone.

Shale.

Trinidad formation. Penetrated to a depth of 24 feet 10 inches.

GENERALIZED SECTION OF THE LARAMIE FORMATION IN THE TRINIDAD DISTRICT.SCALE: 200 FEET 1 INCH.

FOBMA-

TION NAME.

Extrusive basalt (Nb)

Laramie formation (Kl)

Trinidad formation (Ktd)

'EL

"cS

f.02

£

5

NAME OF COAL BEDS. COLUMNAR SECTION.

liilHiSlfilHilH HllniPI

HEIQHTABOTE BASE

IN FEET.

3000

ililBBl

Raton Pass group (small seams, not workable).

Wootton seam, 5 feet (not yet worked).

Morley seam, 6 feet (not yet worked).

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...........................

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IririsfeM^^U^aJ

SS:. 1== =? _:

= \

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2500

1500

1000

750

220

140

100

0

CHARACTER OF ROCKS.

Eruptive flows of gray, drab, brown, and dark- brown basalt, often vesicular.

Heavy-bedded gray sandstone, alternating with thin-bedded, greenish-gray, micaceous sandstone and beds of shale. Massive sand­ stone predominates.

Heavy-bedded gray sandstone, alternating with bands of shaly sandstone and shale, the latter containing the workable beds of coking coal.

Shale and shaly sandstone, with a predomi­ nance of thin-bedded sandstone and shale partings for 250 feet above the base of the formation.

Massive sandstone, containing Halymenites.

Thin-bedded, fine-grained sandstone with shale partings.

Argillaceous shale with ferruginous limestone concretions.

KICHAKD CHARLES HILLS,Geologist.

IP1U. S. GEOLOGICAL SURVEY

CHARLES D.WALCOTTDIRECTOR

ILL! COLORADO(LAS ANIMAS CO.)

ELMORO QUADRANGLE

FIG. 2.-FISHERS PEAK AND BATON MESA.

This view is taken from near the Engle mine. It shows the flat-topped character of the mesa, which rises 3,000 feet above, and the vertical cliffs of basalt forming its summit. The slopes of the mountain are composed of the coal-bearing

Laramie, a hard stratum of which has produced the terrace in the middleground. The rock exposed in the foreground is the Trinidad formation.

FlQ. 3.-CONICAL BUTTES OF IGNEOUS ROCK.

This represents one of the most typical of the volcanic plugs of the district. It consists of a cylindrical mass of basalt occupying the vent of

an extinct volcano, and is surrounded by an accumulation of basalt talus. The butte Is situated one mile north of Adair station, on the

Colorado and Southern Railroad.

FlQ. 4.-IGNEOUS BUTTES OF IRREGULAR FORM.

This is one of a row of plug-like bodies of lamprophyre which are connected with one another by dike-like bodies of the same material. They

occur In the northern part of the quadrangle.

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