498 II. E. Gregory — Reconnaissance of a Portion of the 



17. Shale __' 10 feet 



18. Sandstone, like No. 16 2 



19. Shale ._ _ 12 



20. Sandstone in 3 ± inch beds, wavy, irregular, lenti- 



cular laminae ; cross-bedded, ripple-marked 4 



21. Shale, red-brown, arenaceous, calcareous, banded 



and lenticular _ _.. 7 



22. Sandstone, thin-bedded, lenticular, with bands of 



shale _ .__ 2 



23. Shale, calcareous, argillaceous, arenaceous ; banded 



dark red, light red and purple 18 



24. Sandstone, like No. 22. 2 



25. Shale, like No. 23 6 



26. Sandstone, like No. 22 2 



27. Shale, like No. 23 _ 2 



28. Sandstone, chocolate, calcareous, with scattering 



limestone pebbles ._ _. 3 



29. Shales, chocolate to red, with grey lenses ; arenace- 



ous, imbricated, ripple-marked ; 15 feet from the 

 bottom is a 6-inch bed of sandstone ; top 10 feet is 

 dark red, argillaceous shale in regular beds tra- 

 versed by veins of gypsum 40 



30. Sandstone, chocolate-red ; fine-grained quartz with 

 calcareous cement ; cross-bedding both angular and 

 tangential ; fine to medium-grained ; size of grain 

 varies with each lamina. Near middle of bed are 

 lenses of conglomerate 2 inches to 12 feet wide, 6 

 inches to 100 feet long, highly irregular in shape 

 and composed of chunks and slabs of argillaceous 

 shale, sandy shale and sandstone ; muscovite abun- 

 dant ; forms vertical cliff 52 



31. Shales, chocolate with white bands ; arenaceous and 

 micaceous strata, thin as cardboard, or 2-3 inches 

 thick ; show ripple-marked, mud-cracked, sun-baked 

 surfaces, curled disks, tiny folds and faults 100 



32. Unconformity (?) 



33. Kaibab limestone, beds 2-6 feet ; buff ; fossilifer- 



ous ; cavities filled with calcite. 



Total 390 



A portion of the measured section is shown in fig. 4. 



The Moencopie- Shinarump Unconformity. 



In another connection* the writer has discussed the uncon- 

 formity between the Moencopie and the Shinarump con- 

 glomerate as it is expressed at various localities on the Navajo 

 * This Journal, xxxv, 424-43, 1913. 



