222 



Clementon. — In the vicinity of Clementon, on the north branch 

 of Timber creek, the limestone shows itself in several places, 

 occurring in thin horizontal bands, about six inches in thick- 

 ness, imbedded between layers of the calcareous sand. These 

 layers are some of them two and a half feet thick, furnishing an 

 abundance of excellent calcareous marl, which is used to a small 

 amount in the neighbourhood, and with striking benefit to the 

 crops. The limestone itself is quarried and converted into lime. 

 The upper surface of the stratum is about twenty-five feet above 

 the level of the stream, and is overlaid by about five feet of 

 diluvial matter. 



The stratification here presents a somewhat singular anomaly, 

 the calcareous sand forming in some places tall narrow cones or 

 eminences, rising almost through the overlying stratum, which 

 fills the intervals between them. Some of these cones are four 

 feet high and two or three feet in diameter. 



Analysis of the Limestone from the Farm of Mr. Isaac Thompson^ 

 near Clementon, Gloucester County. 



Composition. — In 100 parts: 



Carbonate of lime, - - 77-0 



Carbonate of magnesia, - 1-5 



Alumina and oxide of iron, 2-0 



Insoluble matter, - - 18-0 



Water, .... lO 



99-5 



The fossils in this limestone are some of them very beautiful 

 and in high preservation. Among them occurs the species 

 Eschara digitata, in vast quantities ; also, Spatavgus parastatus, 

 Ananchytes ductus, and A. fimhriatus, and an echinus; besides 

 Anthophyllum Ailanticum, Scalaria annulata, Gryphea convexa, 

 G. Vomer, Flustra sagena, and teredo ; together with several 

 more zoophytes and shells. 



Medford. — At Charles Haines's mill, two miles below Medford, 

 on the creek, a section is seen exhibiting on the top a greenish 

 siliceous sand ; beneath this, a gray sand some feet thick, contain- 



