326 W. B. CLARK — UPPER CRETACEOUS FORMATIONS OF NEW JERSEY. 



in many instances a marked divergence from these normal conditions, 

 and detached outcrops are at times found far removed from the main body 

 of the deposits. The formations discussed in the following pages are as 

 follows : 



Eocene Shark River formation. 



f Manasquan formation. 



I Rancocas formation i Jincentown lime-sands. 



( be well marls. 



TTnnpr CrPtappons J ( Redbank sands. 



i Monmouth formation. ...\ Navesink marls. 



( Mount Laurel sands. 



Matawan formation 



Hazlet sands. 

 Crosswicks clays. 



Glauconite characterizes all of the deposits from the base of the 

 Matawan to and including the Shark River formation, and appears in 

 varying amounts and under different conditions in the several forma- 

 tions. Their lithologic features are in general sufficiently distinctive and 

 persistent to be of the greatest value in the determination of the horizons. 

 The presence of greensand in situ has not been observed in the Raritan 

 formation which underlies, nor in the Chesapeake formation which over- 

 lies this sequence of glauconitic deposits. 



MA TA WAN FORMA TION. 



Name. — The Matawan formation receives its name from Matawan 

 creek, in Monmouth county, New Jersey, where the deposits of this 

 horizon are typically developed. The name was originally given by 

 the senior author of this paper in an article published in the Journal of 

 Geology,* and was made to embrace in a general way the division to 

 which Professor Cook had earlier assigned the name of Clay Marls, al- 

 though his characterization of the deposits was not complete and was 

 confined almost entirely to their development in northern New Jersey. 

 Furthermore, the term Clay Marls does not adequately describe the de- 

 posits, although beds of that nature are found at various horizons, par- 

 ticularly in the lower portions of the formation. 



Areal distribution. — The Matawan formation extends as an irregular 

 belt from the shores of Raritan bay to the Potomac river. In the ex- 

 treme north, in Monmouth county, New Jersey, the width of the band 

 is from 9 to 12 miles, but in proceeding southward it gradually narrows, 

 with some exceptions due to the topography of the land, and in the 

 southern counties of New Jersey does not exceed 6 miles in width. 

 Upon the western shore of the Delaware river, in the state of Delaware, 

 it has still further narrowed until it has a width of scarcely more than 



* Vol. ii, 1894, p. 163. 



