ART. 14 MICHIGAN TRAVERSE GROUP POHL 9 



distribution of correlative portions of the succession is well ap- 

 preciated when it is understood that only considerably higher beds 

 than are observed in either outcrop are found between the two 

 sections separated by a distance of fourteen miles. Further, a com- 

 parison of the depositional record as seen in the two areas will bear 

 witness to a fairly widely extended continuity of both faunal and 

 physical conditions. 



Section at Petoskey Portland Cement CoJs quarry {locality H) 



Gravel Point stage. 



Note. — Zones 4 and 5 are exposed to best advantage to the west in the 

 newer parts of the quarry (locality 14a). 

 Zone 5. 



Bed 2. Very light gray, granular, fossiliferous limestone, same as 



exposed at locality 14c in similar position. To top of section__2 feet. 



Bed 1. " Cherty " chipstone, lower part " mottled." Light to dark 



gray in color. Fossils scarce with one bed of Favosites noted_8 feet. 



Zone 4- 



Bed 4. Hard, black-brown, bituminous .limestone with black shale 

 partings several inches thick. Limestone in beds about 1 foot thick 

 with fossils scarce; Athyris, Atyrpa. Corals common in shale at 

 top: Favosites, Prismatophyllum. Costate Stropheodontas occur 

 abundantly in black shale partings. One brownish black layer 1 foot 

 thick near top contains a spectacular pelecypod fauna of unde- 

 scribed si)ecies of lUonia, Leioptcria, Actinopteria, Janeia, and a 



small Leptodesma-Wke new genus 6 feet 6 inches. 



Bed 3. " Coral bed." Heavy coral bed with Prismatophyllum masses 

 several feet in diameter. Grey-brown cryptocrystalline "chert" or 

 chipstone (lithographic limestone), becoming granular at top with 

 shallow depressions filled with black shale. Fauna: Digitate and 

 turbinate Favos-itcs, Prismatophyllum, Zaphrentis, Atrypa, Athyris, 

 Cryptonella, Crania, and a costate Stropheodonta—1 foot 10 inches. 

 Bed 2. Brov\'nish black "chert" (cryptocrystalline chipstone), in beds 

 of moderate thickness with some black shale partings bearing corals 

 and costate Stropheodontas. Several more granular, fossiliferous 

 layers. One of these, 30 inches from top, contains Proctus, Phacops, 

 Asteropyge, Pterinopecten, Actinopteria, Aviculopecten, Stropheo- 

 donta concava and costata types, a large, mucronate Spirifer, 



Atrypa, Athyris, and crinoid joints 7 feet 6 inches. 



Bed 1. Dull gray, fossiliferous limestone with shale partings, in beds 



about 1 foot thick 13 feet 6 inches. 



Zone 3. — " Emmetensis zone." 



Gray limestone in regular, rather thick beds splitting in thin slabs on 

 weathering. Nacreous fossils conspicuous, frequently possessing a pink- 

 ish co.lor. Corals developed in irregular, reef-like structures along certain 

 beds. Rock adjoining coral reefs granular. Fauna: Chonetes emme- 

 tensis Winchell, Pholidostrophia, mucronate Spirifer, solitary and 



colonial corals 14 feet 6 inches. 



Zone 2. — " Large Atrypa zone." 



Bed 8. Barren, light gray, compact limestone with shalelike partings 

 of similar composition. Mottled and with iron-stained worm borings. 



3 feet 6 inches. 

 Bed 2. Brown limestone carrying Oypidida 11 inches. 



61590—29 2 



