10 S. W. WILLISTON AND E. C. CASE 
SECTION II 
POLEO CREEK 
Gray sandstones, mostly even grained with 
pebbly conglomerates and _ shales below. 
Phytosaursstce's sae ee al bie petals 
Softer gray sandstones, weathering into sand... 
Sandy clay, with beds of thin black shale; plant 
Temas etossiluwoOd tas pose aac) een eae ee 
Sandysclayy black andisreent =). meee: 
iPunplishisancyaclaygaerd se eae ese see 
G@oarsesyellow sandstome sare ance eee 
Toooserebayn Sandie caved cepa: se ergsgtye tear a ieee 
Green and purplish sandstones............... 
Gray7and)purplishisandstones:.- 4.0: ee 
Hard clay, variegated and jointed (cliffs)...... 
Purplish;sandstones|and rediclay 5-455 40° -- 
Loose white sand with beds of red clay........ 
Hirstredinodulanlayerac ss pe. a: eee : 
Soft fine-grained, light red sandstones, cross- 
bedded, forming tops of pyramids and cliffs. . 
Soft fine-grained, light red sandstones, cross- 
bedded with lighter bands of pebbles........ 
Second red nodular layer, with clay........... 
Riediclay Grn tienes a cate Cmaps teatime 
Coarse cross-bedded sandstones.............. 
third red:nodularlayerna.c.. eee ee ce 
Red cross-bedded sandstones.........:....... 
Darksred andrereeniclayy se 4a ee 
Coarse red and green sandstones.............. 
Hardsredisandstoneswclitisy 5 aqnce eee 
Red sandstone and clay with thin band of harder 
Sandstome ts. ;ve.cton Neoweesek tee cule ee 
idiard, redvcoarse sandstones Wi) 42s eee 
Rediclayens warn. o> keane kena eee ate 
Redisandstoneblutise. Wimsatt eee 
Red sandstone with thin seams of clay, reptile 
DOMES aaa icy sey seo anal aa espn etree 
Red clay with thin nodular layers............ 
Dark red, coarse sandstones (cliffs)........... 
Redisandy: clay ther «2. ces See cee 
Dark red, coarse sandstone, jointed........... 
Red clay, even texture, vertical rain erosion... . 
Dark rediclay yea. see eee eee ee 
Reed shi alive clave 5 (7h ive tence cela erase ue ia) Searels 
iHleavy, grayasandstOnes me etear a ae ene 
Redisandstonesiandiclaysp vars an eee 
Upper Trias 
ae 
Upper Trias ? 
Lower Trias? Barren 
ce ce 
Base (?) of Trias 
Top (?) of Permian 
Permian, fossiliferous 
(a3 
