14 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.76 



Gravel Point stage. 

 Zone 6. 



Bed 3. Bottom of section exposed. The " Blue Shale " or uppermost 

 bed of the Gravel Point was dug from a small test pit in the floor of 

 the quarry bringing with it the typical association of fossils — 10 feet. 



The next section, to be seen near the east end of the town of 

 Petoskey, completes the unbroken sequence in the stratigraphic 

 record of the Traverse. Diligent search, which will be undertaken 

 shortly, will in all probability result in the discovery of whatever 

 beds may be unrepresented in the present succession. It is highly im- 

 portant that a complete succession be established, for such an un- 

 broken record would have immediate usefulness in determining hori- 

 zons in projected borings. It is highly improbable that any great 

 thiclaiess of beds is absent from the known sequence, for were that 

 the case it would undoubtedly have been recognized in one or another 

 of the numerous fortuitous quarry locations. 



Oeological section in quarry of Northern Lime Company {locality 18) 



Top of section. 

 Petoskey formation. 



Zones undifferentiated. 



Bed. 3. Granular, fine-grained, light gray limestone in heavy beds, full 

 of isolated Stromatoporas. Partings of black shale between bedding 

 planes. Fauna : Digitate Favosites, encrusting Stromatopora, 

 Zaphrentis, arbusculate Favosites, CylindrophylUim, compound 



CystiphyUum, Gypidula 7 feet. 



Bed 2. " CystiphyUum Bed." Light gray, compact limestone in two 

 beds, breaking into small, angular fragments, Fauna : Digi- 

 tate Favosites, Zaphrentis, Atrypa, Athyris, and Cystiphyl- 



lum 5 feet 9 inches 



Bed 1. Fine-grained, brown limestone. The major portion of the 

 thickness is composed of isolated, broken, and overturned Stroma^ 

 topora heads, in some places filling the bed from top to bottom in 

 reeflike structure. The interspaces between the reefs are filled 

 with a thick-bedded, often foreset, matrix of fragmental, " coral sand." 

 The thickness of the bed remains constant laterally. Fauna : 

 Arbusculate Favosites, small-pitted and digitate Stromatoporas, and 



Atrypa 26 feet. 



Zone 1. 



Bed 1. Eeworked layers between the cessation of erosion of the 

 Charlevoix beds and the beginning of prolonged deposition (?). 

 Generally a light gray, fine-grained limestone carrying small, angu- 

 lar, limey fragments and with many irregular, bituminous partings. 

 Top bed muddy, carrying a lenticular pebble conglomerate. Upper 



surface of underlying bed irregularly eroded IV-i to 3 feet. 



Charlevoix stage. 



Beds 6 and 7. Granular, dirty, brown limestone full of wavy, bituminous 



laminae. Single bed 3 feet 6 inches. 



Bed 5. " Pelecypod-Gastropod Bed." Gray-brown, very fine-grained lime- 

 stone. Massive and with conchoidal fracture 12 feet. 



