10 PROCEEDIISI GS OF THE NATIONAL MUSEUM vol.76 



Gravel Point stage — Continued, 



Zone 2. — "Large Atrypa zone" — Continued. 



Bed 1. Thick-bedded, gray limestone with shaley bands. Limestone 

 breaks into thin beds on weathering. Fossils conspicuous on bed- 

 ding planes. Fauna: Large Atrypa, Stropheodonta concava and 

 costata types, mucronate Spirifer, Cyrtina, globose Athyris (almost 

 limited to a single layer near middle) Spirifer euryteines type, 



Douvillvna (rare), Zaphrentis, digitate Favosites 10 feet. 



Zone 1. — Chocolate-brown, hard, finegrained, resistent limestone with 

 numerous fossil fragments and crinoid joints, in thick beds. Fauna 

 consists mainly of Oypidula, Prismatophyllum, Pholidostrophia. Bottom 

 not shown 8 feet. 



The sequence is then further continued in a section exposed in an 

 old, abandoned quarry (locality 14c), about an eighth of a mile back 

 from the shore of Little Traverse Bay and a mile west from the last- 

 mentioned outcrop (locality 14). The section begins with the base 

 of bed 2 of zone 5 seen near the top of the exposure at the Petoskey 

 Portland Cement Go's quarry, and extends upward to a position near 

 the base of the " Blue shale." 



Section at aMndoned quarry (locality IJ^c) 

 Drift covering. 

 Gravel Point stage. 

 Zone 6. 



Bed 2. Equivalent to bed 2 of locality 14e. Dirty, bituminous, light 

 brown limestone with bands of fucoidal markings. Fossils, especially 



Prismatophylhcm, common. Thickness exposed 10 feet. 



Bed 1. " Lower Blue Shale." Fossils abundant, large numbers of 

 costate Stropheodontas, Atrypa, digitate Favosites, Prismatophyllum, 

 mucronate Spirifer, large Spirifer, Athyris, Cyrtina, Fenestella, and 



many encrusting, ramose, and flabellate bryozoa : 1 foot. 



Zone 5. 



Bed 8. Resistant, dark gray, fragmentally fossiliferous limestone with 

 cryptocrystalline matrix weathering into large blocks. Fossils, 

 especially Favosites, abundant at contact with lower shale. 



2 feet 6 inches. 

 Bed 7. Fossiliferous black shale. Costate Stropheodontas abundant. 



Atrypa, Fenestella 6 inches. 



Bed 6. Corraline, fossiliferous, fragmental limestone passing horizon- 

 tally into chipstone similar to that in bed 5 below. Reef conditions 

 with large masses of corals conspicuous, and fossiliferous black shale 

 partings. Fauna : Prismatophyllum, Strom,atopora (distantly mam- 

 millated and nodose forms), dumose and digitate Favosites, of many 

 varieties, Cladopora, Zaphrentids, and encrusting Trepostomes, 

 Atrypa, Gypidula, Cyrtina (rare), costate Stropheodontas, Proetus. 



12 feet. 

 Bed 5. Similar to beds 2 and 3 but darker and less slabby. Black 

 shale parting several inches from top of bed. The upper surface 

 of the bed consists of black shale, locally stained red and covered 

 by an abundance of markings similar to worm borings, one-quarter 

 to 1 inch in diameter, several feet long and depressed. Depres- 

 sions filled with material from succeeding bed (bed 6); Fauna: 

 Digitate Favosites and Athyris 1 foot 6 inches. 



