150 



CAPE COD GEOLOGY 



was derived from layers above or beneath the lignitic and leaf-bearing clays 

 referred to the Magothy formation, but the known facts justify its reference 

 to the beds overlying the Magothy on Marthas Vineyard. 



The plant-bearing Magothy beds appear chiefly in the lower parts of 

 the island, as in the Gay Head cliffs, on the terrace at Makonikey, and in the 

 sea-shore cliffs near Cape Higgon and westward toward Menemsha. These 

 tracts of Cretaceous appear to be wholly or chiefly Magothy, and the uplands, 

 from Prospect and Peak Hill eastward into Indian Hill, where overlying Cre- 

 taceous sands and clays, apparently without lignites, have been folded up, 

 may represent the Matawan and be the source of the fossiliferous marine 

 blocks. The abundance of the material nearly in place near Indian Hill points 

 to this conclusion. 



The fossil marine fauna found by Shaler * in loose fragments of sandstone 

 in the drift at Indian Hill and at Lagoon Pond are referred to the Cretaceous. 

 The genera are given in the following list. Owing to the fragmentary nature 

 of the material most of the specific names were not given. All are figured. 



Plicatula or Ostrea 



Ostrea or Exogyra 



Exogyra 



Cardium f 



Lucina 



Tellina (Linearia) f 



Lucina f 



Camptonedes burlingtonensis Gabb. 



Camptonedes parvus Whitfield (?) 



Modiola f (2) 



Anomya f 



Nuculana 



Ptcria 



Turritella (Nerinu) 



Turritella 



Cerithium 



Chemnitzia 



One thought to be a new genus 



The determination of these fossils was confirmed by C. A. White, who, 

 in a later paper, 2 correlated the beds in which they occur with the Tombigbee 

 sand of Alabama, and stated that they could be provisionally referred to the 

 base of the marine division of the Cretaceous of the Atlantic border. 



REPORT ON COLLECTION OF UPPER CRETACEOUS INVERTEBRATE FOSSILS 

 FROM MARTHAS VINEYARD, MASS. 



By L. W. Stephenson 



Collection made by David White in August, 1890 



U. S. G. S. Coll. 788. Lagoon Pond, 2 miles above Vineyard Haven, Marthas 



Vineyard, Mass. 



1 Shaler, N. S., On the occurrence of fossils of the Cretaceous Age on the island of Marthas Vineyard, 

 Mass., Bull. Mus. Comp. Zool., Harvard Univ., Geol. ser. 2, 16, No. 5, pp. 89-97, pi. 1 (map), pi. 2 (fossils), 



1889. 



2 White, C. A., A review of the Cretaceous formations of North America, U. S. Geol. Survey Cor- 

 relation papers, Bull. 82, p. 93, 1891. 



