AET. 14 MICHIGAN TRAVERSE GROUP POHL 13 



Geological section at the Curtiss quarry (.locality 12) 



Petoskey fat-mation. 



Zone 2. — "Fenestella zone." 



Bed 2. Similar to the crinoidal portion of zone 1 below, but carrying 

 numerous broken fragments of Fenestellids. Thickness exposed. 



6 feet 6 inches 

 Bed 1. This bed is made up of numerous layers of rather coarse, 

 yellowish limestone, containing an overwhelming abundance of many 

 Devonian types of bryozoa, but particularly the Fenestellidae, large 

 and small Spirifers, and Gypidulas. The limestone layers are sepa- 

 rated by fine shale partings 5 feet 



Zone 1. — " Cyrtina-Gypidula zone." 



The base of this bed, which is dirty throughout, is particularly frag- 

 mental. It lies unconformably and by overlap on the various beds 

 of the eroded Charlevoix series. The lateral variation of the lith- 

 ologic character, being made up at places throughout the thickness 

 of the bed of coarse, crinoidal fragments, and at others of a finer, 

 granular, dolomitic limestone, containing the typical association of 

 the Cyrtina-Gypidula zone, indicates a differential sorting probably 



due to unstable conditions to 12 feet 



Charlevoix stage. 



Bed. 9. Gray, fine-grained limestone with numerous cavities ; breaking into 

 small, angular fragments. Base stylolitic. Barren. Maximum thick- 

 ness preserved 2 feet 6 inches. 



Bed 8&. Similar to bed 8a in lithologic character, but unfossillf- 



erous 1 feet 6 inches 



Bed 8a. Coral laj'er containing same fauna as below but in exceeding 

 abundance. Darker gray, less compact, more resistant, and less brittle 



than bed 8 6 to 9 inches. 



Bed 8. Grey, lithographic, conchoidally fracturing chip-stone. Lower 6 

 inches finely and very unevenly and undulatingly laminated, dirty, granu- 

 lar, and porous. Fauna comprises a digitate and dumose Favosites and 

 digitate Stromafoporas, a large Stromatopora and an intermedia-like 



Ceratopora 4 feet 8 inches. 



Bed 7. Earthy limestone full of limonitic stains and containing wavy 



brown laminations. " Brown Bed " 1 feet 3 inches. 



Bed 6. Gray, partially porous and fragmentally grained, fine-grained lime- 

 stone with numerous, thin, black, bituminous laminations- 1 foot 9 inches. 

 Bed 5j. " Pelecypod-Gastropod Bed." Coarse, buff limestone in lower 3 

 feet, oolitic, with grains a milimeter or two in size, above. Two pelecy- 

 pods, Edmondia mactroides Winchell and Edmondia ledoides Winchell 

 and three gastropods, Pleurotomaria cavumbilicata Winchell, P. em- 

 metensis Winchell, and P. parvispira Winchell are particularly abundant 



in, and are restricted to this bed 14 feet 6 inches 



Bed 4. " Dumose Favosites Bed." Dolomitic, buff limestone with the 

 typical fossil asspciation of this bed as at Charlevoix Rock Products Co.'s 



quarry, etc 3 inches. 



Bed 3. Massive, buff, dolomitic limestone, at places bituminous and lami- 

 nar, with large discoidal lenses of fragmental limestone 3 feet. 



Bed. 2. Heavier, thin-bedded, shallow-water limestone with very uneven 



laminations and containing fine sand grain inclusions 1 foot. 



Bed 1. Thin bedded, uneven, bluish-gray limestone, frequently coated 

 brown due to weathering of contained pyrite. Thin shale like partings 

 with numerous minute sand grains 4 to 8 inches. 



