st. JoxN.|] JOHN DAY BASIN—SECTION OF MESOZOIC STRATA. 193 
From the divide at the head of the west branch of this stream and a 
shallow meadow-valley tributary to the Kast Fork of John Day’s River, a 
section was hastily examined extending over to Station XI ridge in the 
vicinity of Station LX, a distance of about 4 miles, or between 6 and 7 
miles west of the crest of the John Day ridge. ‘The section alluded to, a 
diagram of which is given on an accompanying plate, is described below: 
Section east of Station LX. 
No. 1. Carboniferous limestone, in crest of Station VIII, or the John 
Day ridge. 
No. 2. Heavy deposit of red or flesh-colored and white quartzitie sand- 
stone, much broken up, corresponding to the upper siliceous member of 
the Carboniferous. 
No. 3. imperfectly exposed series of reddish and buff laminated sand- 
stones and arenaceous shales, dip WSW. at angles of 55° to 45°, oceupy- 
ing a belt half a mile or more across. This series is the equivalent of 
the Trias, its outcrop for a large part of the distance forming a well 
defined and, in places, rugged outlying ridge along the west foot of the 
mountain. Probably 2,000 feet thick. 
No. 4. Clays and chocolate-red sandstone. 
No. 5. Light weathered, bluish, spar-seamed, and cherty limestone, a 
thickness of 5 feet exposed of an apparently heavy bed, dipping west- 
ward. Contains obscure fragments of fossils, a small gasteropod, re- 
ferred provisionally to Lioplacodes veternus M.and H., being most numer- 
ous and best preserved. 
No. 6. Space, probably shales. (150 yards, + —.) 
Ne. 7. Buff and rusty colored; rather hard fragmentary sandstone, 
associated with ferruginous gritty indurated deposits. 
No. 8. Space. (100 yards, +—.) 
igi? any gray, laminated, rather hard sandstone; dip 40°, about 
. 10° 8. 
No. 10. Space. (300 yards, +—.) 
No. 11. Reddish buff sandstones, with traces of vegetable remains, 
forming a heavy ledge, 50 yards across the exposure. 
Ne. 12. Space. (150 vards, + —.) 
No. 13. Heavy bed of light gray and buff, reddish tinted, fragmentary 
sandstone, overlaid by grayish indurated clay and a band of light colored 
chert, 50 yards across the exposure. 
No. 14. Dark blue, indurated clay shales, exposed in steep bluff slopes 
on the east side of Kast Fork, east of Station IX. 
No. 15. Gray, dark rusty weathered‘ sandstone, forming a heavy bed 
overlaid by greenish-gray and reddish layers with bands of flesh-colored 
chert and dark indurated clay shales. Exposed in bluffs on the west 
side of East Fork; dip 30°, about W. 30° S. 
No. 16. Yeliow and drab shales, with seams of white calcite, underlaid 
by gray, shaly sandstone. 
No. 17. Gray and buff, dirty weathered, obliquely laminated sandstone. 
No. 18. Gray and reddish thin-bedded sandstone, including a ledge of 
conglomerate composed of water-worn quartz pebbles, together forming 
a heavy bed outcropping in the broken slopes east of Stations LX and 
X; dip westward at a moderate angle. 
No. 19. Gray sandstones and light clays, exposed at intervals over a 
space 500 yards or more across; dip southwestward. 
0. a Rusty gray sandstone, obscurely exposed, ledge, tilted nearly 
vertical. :, 
13H 
