CAPE COD GEOLOGY 



25 



usually regarded as of Upper Cretaceous age. In the broken interior of the speci- 

 men collected in 1917 there is a tooth, about 2 mm. long, of a small fish having 

 the habit of minute forms referred to Lamna cuspidata Agassiz, which ranges in 

 New Jersey from the Cretaceous ? through the Eocene into the Miocene. No 

 specimens having this matrix of white kaolinite have been seen in place at Gay 

 Head. If a specimen of Cardium virginianum should be found in place in the kao- 

 linite bed below the osseous conglomerate, it would indicate that the Chesapeake 

 Miocene included beds of white clay and kaolinite older than the osseous con- 

 glomerate and probably also older than the bed of greensand, but younger than 

 the beds carrying identifiable remains of Cretaceous plants. 



A fragment of the inner cast of the body whorl of a species of Nassa found 

 in the greensand bed at Gay Head in October, 1917, by Mr. L. G. Darrow, of 

 Cambridge, Mass., was submitted to Dr. Dall, who remarked its essential agree- 

 ment in sculpture with the Miocene Nassa trivilattoides of Whitfield, from New 

 Jersey, a species occurring also in the Miocene of Maryland, and ranging there 

 from the Calvert formation upward into the Choptank. The species is restricted 

 to the Miocene. 



The species above named were obtained from the greensand beds in cliffs 

 at Gay Head between Stations 13 and 35 of the map of Gay Head published in 

 1897 in volume 8 of the Bulletin of the Geological Society of America as Plate 16. 



The fossils collected in 1889, mainly by me, from Nashaquitsa cliffs on what 

 was known as the Ephraim Mayhew farm, were also reported on by Dall in 1916 

 as containing the following species : 



Macoma lyelli Dall 

 Nucula shaleri Dall 

 Yoldia (cf. Ysapotilla Gould) 

 Panopea goldfussi Wagner 

 Pecten magellanicus Gmelin 

 Aemaea sp. 



Modiolaria laevigata Gray 

 Venus mercenaria L. (young) 

 Solen sp. 

 Euspiraf sp. 

 Barnacle valve 



To these fossils should be added the single mesial dental or plate tooth of a 

 species of Miliobates found in the greensand bed at Nashaquitsa in September, 

 1889, but unfortunately lost in transportation. 



The fossil shark teeth and the fish vertebrae found in the greensand, particu- 

 larly those found in the Aquinnah osseous conglomerate, have not been identified. 

 Many teeth pertaining to species of Carcharodon, Otodus, Galeocerdo, Hemipristis, 

 and possibly other genera have been collected. 1 



1 For illustrations of similar fossil fish teeth see Fowler, H. W., A description of the fossil fish remains 

 of the Cretaceous, Eocene, and Miocene formations of New Jersey, Bull. Geol. Survey of New Jersey, 4 



