154 



CAPE COD GEOLOGY 



by Prof. N. S. Shaler in the Bulletin of the Museum of Comparative Zoology, Geol. ser. 2, 

 16, No. 5, 1889, Plate 2, to which references are made below. 



No. 4. Apparently a fragment of a large gastropod belonging to the Volutidae. 



Nos. 6 and 9. Modiola. (Prof. Shaler's fig. 18, and perhaps 17.) 



Nos. 7 and 8. Impressions of a Plicatula or a Placunanomia. Resembles Placunanornia 

 lineata Conrad. 



No. 15. Undetermined. (Prof. Shaler's fig. 1.) 



No. 16. Impressions of Turritella, Corbula, and another small lamellibranchs. 



No. 18. Exogyra'! (Possibly the same as Prof. Shaler's figs. 19 and 20, though his speci- 

 mens seem to be without plications. This species has some resemblance to the Eocene Ostrea 

 compressirostra.) 



No. 19. Avicula. (Apparently not the same as Prof. Shaler's fig. 5. Compare Avicula 

 petrosa Conrad.) 



No. 20. Ostrea. (Prof. Shaler's fig. 16.) 



No. 30. Fragments of wood in sandstone. 



No. 34. Modiola and Anomia. 



No. 38. Lucinal (Prof. Shaler's fig. 11.) 



No. 8. bis. Boulder full of Ostrea sp. 



Dr. Stanton does not know what disposition was made of this collection, 

 but presumably it was returned to Prof. Battey. 



The specimens named in the foregoing lists are poorly preserved and the 

 specific determinations are doubtful, but they throw some light on the age of 

 the formation from which the ferruginous masses were derived. 



The small Gryphaea-like oyster appears to be unlike any oyster heretofore 

 found in the Atlantic and Gulf coastal plain. 



The identification of Exogyra ponderosa Roemer is fairly satisfactory and 

 probably indicates a position within the Exogyra ponderosa zone. 



The sculpture of the Pecten, which is compared to P. argillensis Conrad, 

 is well preserved and is very close to that of typical examples of the species 

 from the Ripley formation (Exogyra costata zone) of Tippah County, Miss. The 

 range of the species is not sufficiently well known to serve as a basis for corre- 

 lation. 



Anomia argentaria Morton is a wide-ranging form in the zones of Exogyra 

 ponderosa and Exogyra costata. 



Paranomia scabra is common to the Exogyra costata zone and the upper part 

 of the Exogyra ponderosa zone but has not been reported in the lower part of the 

 Exogyra ponderosa zone. 



Specimens of Corbula like that here compared to C. carolinensis Conrad have 

 not been reported from deposits younger than the zone of Exogyra ponderosa. 



The evidence afforded by the invertebrates seems to favor the Matawan 

 age of the deposits in which the fossils were originally embedded, but it is in- 



