STRATIGRAPHY AND FOSSILS OF MANASQUAN FORMATION. 



341 



SircUigraphic relations. — The Manasquan formation rests conformably 

 upon the Rancocas formation, the line of contact being sharply defined 

 in the few places where surface exposures have been found. At these 

 points, namely, upon the Manasquan river to the west of Farmingdale 

 and upon the southwest branch of Rancocas creek to the southwest of 

 Med ford, the light-colored clays which form the base of the Manasquan 

 rest conformabl} T upon the Vincentown lime-sands of the Rancocas for- 

 mation. The Manasquan formation is conformably overlain by the suc- 

 ceeding Shark River formation, the line being less sharply defined than 

 in the case of the basal contact. 



Fossils. — The fossils of the Manasquan formation are neither numerous 

 in individuals nor in species, except At a few localities. The forms 

 determined are the following : 



Textularia agglutlnans, d'Orbigny. 

 Tritaxia tricarinata (Reuss). 

 Xodosaria spinulosa (Montagu). 



Ostrea glandiformis, Whitfield. 

 Gryphxa bryani, Gabb. 

 Modiola johnsoni, Whit. 

 Area quindecemradiata, Gabb. 

 Cardita intermedia, Whit. 

 Crassatella conradi, Whit. 

 Crassatella delawarensis, Gabb. 

 Crassatella Uttorahs, Conrad. 



Globigerina bulloides, d'Orbigny. 

 Truncatulina wuellerstorfi (Sch wager). 

 Terebratulina atlantica, Morton. 



Crassatella rhombea, Whit. 

 Cardium (Criocardium) nucleolus, Whit. 

 Veniella rhomboidea, Conrad. 

 Caryatis (?) veta, Whit. 

 Petricola nova-ivgyptica, Whit. 

 Veleda nasuta., Whit. 

 Periplomya truncata, Whit. 

 Panopsea elliptica, Whit. 



SHARK RIVER FORMATION. 



Name. — The Shark River formation * was earlier so named from its typ- 

 ical occurrence in the upper valley of Shark river, Monmouth county, 

 New Jersey. It includes the upper division of the Upper Marl bed which 

 was designated as Blue marl by Professor Cook. 



Areal distribution. — The Shark River formation is confined to a very 

 limited district in eastern Monmouth county, New Jersey, being known 

 definitely only to the northwest of Asbury Park and in the valleys of 

 the Shark and Manasquan rivers. Its surface outcrops are confined to 

 the valley sides, being deeply buried in the intervening country by Mio- 

 cene deposits. To the south of Monmouth county the Shark River for- 

 mation has been nowhere observed, although it doubtless occurs beneath 

 the Miocene cover. 



Character of materials. — The deposits of the Shark River formation con- 

 sist of very fine dark green sands, at times with a bluish tinge, and with a 

 greater or less admixture of argillaceous materials. An indurated stony 



Journal of Geology, vol. ii, 1894, p. 167. 



