ART. 14 MICHIGAN TRAVERSE GROUP POHL. H 



Gravel Paint stage — Continued. 

 Zone 5 — Continued. 



Bed 4. Granular, fragmental, fosslliferous limestone with Stromn- 

 topora, costate Stropheodontas. Fauna nearly same as in bed 6 

 above 6 inches. 



Bed 3. Similar to bed 5 above 3 inches. 



See covered interval 3 feet. 



Bed 1. Base of section exposed. Very light gray chipstone (litho- 

 graphic limestone). Mottled, due to leaching. Fossils sparse: 

 Atrypa 5 feet. 



About three-quarters of a mile farther west the sequence is again 

 continued through younger beds, and with the inclusion of this last 

 locality the character and thickness of the Gravel Point stage so 

 far as exposed may be realized. Due to the incoherent character 

 of the upper member of the Gravel Point stage and its tendency 

 to break down quickly on exposure, this bed and its contact with 

 those immediately following may seldom be studied. 



Section at abandoned "Bell" Quarry {locality l^e) 



Charlevoix stage. 



Bed 4. " Dumose Favosites be<l." Thickness exposed 4 to 9 inches. 



Bed 3. " Laminated bed." Grey, coarsely crystalline, granular, porous 

 limestone with the laminations, probably due to algal growth, decreasing 

 in thickness upward and with the lower 2 inches and upper 6 inches 



unlaminated 2 feet 9 inches. 



Bed 2. Pure, buff limestone of lithographic texture 1 foot 9 inches. 



Bed 1. Reworked, fragmental clay shale 6 inches. 



Oravel Point stage. 

 Zone 6. 



Bed 3. " Blue Shale." Bluish-gi'ey, incoherent, calcareous shale with 

 numerous more coherent limey lenses. This bed quickly weathers 

 to a sticky, gritless mud, carrying long selenite crystals and allowing 

 the abundance of finely preserved fossils to roll free. The basal 

 foot of this member is more pyritiferous than usual and carries a 

 great number of small crushed Conocardium emmetensis Winchell. 

 Fauna of entire bed ; Atrypa, Athyris, costate Stropheodonta, Pris- 

 matophylhim, Cystodictya and many other bryozoa, and Conocardium 



are the most abundant 8 feet. 



Bed 2. Same as zone 6, bed 2 of locality 14c 14 ft. 



Bed 1. "Lower Blue Shale" 1 ft. 



Section up to " Lower Blue Shale " is a duplicate of that at locality 14o__25 ft. 



A hitherto unnoted section ties in with the upper portion of the 

 two last-mentioned locations and carries the sequence still higher 

 into the Charlevoix stage. This is one of the natural outcrops that 

 preserves one of the most seldom seen Traverse phenomena — ^the con- 

 tact between the Gravel Point and the Charlevoix stages. This sec- 

 tion, on the shore of Little Traverse Bay at the Bay View Pere 

 Marquette railroad station, was found to be the key to the entire 

 problem of exposed Traverse sequential events, for it presents beds 



