12 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 76 



for a considerable stratigraphic distance on either side of the con- 

 tact and gives unquestionable evidence for the establishment of a 

 continuity of sections at this previously debated position. The beds 

 here have a rather strong (15°), local, average, easterly dip which 

 gives a comparatively thick section in the limited exposure of the 

 15-foot bluff. 



Oeological section at Bay View railroad station {locality 18a) 



Drift covering. 

 Charlevoix stage. 



Bed 6. " Pelecypod-Gastroxx)d Bed." Massive, tliiclc, bedded, brown lime- 

 stone, barren below, thin bedded above with large, discoid, lenslike inclu- 

 sions. Thickness exposed 7 feet, 4 inches 



Bed 5. " Dumose Favosites Bed." Buff to brown, granular limestone with 

 the leached corrals occurring in abundance in two bands and with the 

 Characteristic fauna continuing into the bed shown above as in the 

 Curtiss quarry (locality 13). Top layer finely and unevenly 



laminated 9 inches 



Bed 4. Similar to bed 2 below 1 foot 1 inch. 



Bed 3. Massive, brown, bitumnnous limestone, breaking vertically ii'tc 



polygonal blocks 1 foot 2 inches. 



Bed 2. " Laminated Bed." Similar to that at following section (locality 



13) 1 foot 3 inches. 



Bed 1. Bluish limestone with numerous, rounded sand grains. Mate- 

 rial reworked from beds below with a few fragmental and worn fos- 

 sils 1 foot, 7 inches 



Gravel Point stage. 

 Zone 6. 



Bed 3&. "Blue Shale." Same as at locality 14c 9 feet. 



Bed 3a. " Conocardium Bed." Bluish grey, fragmental limestone, 

 weathering brown. This is not a reef limestone, the corals being 

 usually of solitary type. Prei>ouderance of Conocardium emmetcnse 

 Winchell, Fenestellas, Cladopora, Favosites, Zaphrentis, plicate 



Gypiduta 12 to 14 inches. 



Bed 2. Same as at localities 14c and 14e. Light brown, compact, 

 bituminous limestone of reef composition. Isolated crystals of sele- 

 nite occur throughout the matrix. Dominant fauna of reef corals 

 and stromatoporoids, very numerous: Prismatophyllum, distantly 

 and closely mammillated types of Stromatopora, Conocardium, cos- 

 tate Stropheodonta, Atrypa, and Phacops. Thickness exposed above 

 water level 4 feet 9 inches. 



That there was at least a local withdrawal of the Traverse sea 

 previous to the deposition of the Petoskey formation can not be 

 doubted after a study of the unconformable relations of the Charle- 

 voix and Petoskey beds to each other, especially in the section to 

 follow. The reader is referred to the insert on Plate 2 for a graphic 

 representation of the actual conditions of contact at this locality. 

 The following section is chosen from the east end of the quarry so 

 as to include the maximum thickness of Charlevoix beds which are 

 elsewhere truncated by pre-Petoskey erosion. 



