CAPE COD GEOLOGY 27 



(Balaenopteraf sursiplana). He states that at least four genera of cetacea are 

 represented by the collections, among them the tooth of a squalodon (Basilo- 

 saurus atlanticus) , which has also been found at Shiloh, New Jersey. 



Crustacea are represented in the greensand by a barnacle (Balanus concavus 

 Brown) and two genera of crabs (Archaeoplax signifera Stimpson, and Cancer 

 proavitus Packard). 1 



FOSSILS FROM THE GREENSAND AT MARSHFIELD AND DUXBURY 

 The Miocene greensand and the overlying clay marl at Marshfield and 

 Duxbury have afforded only a few fossils, some of which are not in existing col- 

 lections. The list of fossils below summarizes the notes given elsewhere in this 

 report. 



Fossils from the Miocene Greensand and the Overlying Clay Marl at Duxbury and 



Marshfield, Mass. 

 Foraminif era : 



Casts of several unidentified species 

 Gastropods : 



Fulgurf sp. (Turbe of Edward Hitchcock) 

 Pelecypods : 



Venus f sp. 



Venus sp. cf . campechiensis var. nwrtoni Conrad 



Panope sp. cf. P. goldfussi Wagner 

 Crustacea : 



Cancer proavitus Packard 



Large claw of a crab (?\ poorly preserved 

 Fishes : 



Oxyrhina desori Agassiz 

 Mammals : 



Cetacean bone (unidentified) 



MIOCENE FOSSILS FROM OTHER DEPOSITS 

 At Nashaquitsa cliffs, on the south side of Marthas Vineyard, a considerable 

 number of Miocene fossils, most of them waterworn, have been found in basal 

 Pleistocene gravel and sand. In 1889, in an hour's search, I collected 70 fish teeth, 

 mainly those of sharks, from a bed of coarse sand that is believed to lie below the 

 Jameco gravel, probably the bed here called Weyquosque Sand. 



1 Stimpson, William, On the fossil crab of Gay Head, Boston Jour. Nat. Hist., 7, pp. 583-589, 1863. 

 Packard, A. S., A new fossil crab from the Miocene greensand bed of Gay Head, Marthas Vineyard, with 

 remarks on the phylogeny of the genus Cancer, Proc. Am. Acad. Arts and Sci., 26, pp. 1-9, 1900. Cush- 

 man, J. A., Fossil crabs of the Gay Head Miocene, Am. Nat., 39, pp. 381-390, pi. 2, 1905, includes a 

 restoration of Archaeoplax signifera. Collections in the Museum of Comparative Zoology and the Bos- 

 ton Society of Natural History. 



