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1039

April 20

Northwest of Ojo Bonito

Section along a line N 70° W - dip = N 10° E 38° N

Went back to Permian NW of Ojo Bonito. Walked long section near west end and on north side of road. This section started at road which ran on the contact of the "biohermal beds" and the lower cherts and went on through the latter into the Word type and beyond this into dark thin shale capped by a conglomerate which we think is cutaceous.

[[image: left margin geologic column]]

cgl   |
-------
200'  | A
-------
1/2'  | B
-------
595'  | C
-------
170'  | D
-------
120'  | "Bioherms"
 ?    | E
-------

[[/image]]

A - Thin platy black shale, sandy, with some black ls. concretions occupied an interval of 166 paces = 415 feet = about 200' vertical

B - 1/2 foot limestone band with large fusulines and a few brachiopods = 733z.

C - An interval of 474 paces of yellow brown ss and siliceous shale with occasional gray ls. lenses, one about 40' from the base is of spirulite = 7.34a This equals a vertical thickness of about 595