270 



Lower part of the Stratum. 



Description. — Colour, very light greenish-gray ; highly clayey 

 and adhesive. 



Composition. — In 100 parts: 



Greensand, . - - 38-05 

 Clay, .... 26-95 

 Quartzose sand, - - 3500 



100-00 

 The proportion of potash which this marl contains, deduced 

 from that in the greensand, is 4-3 per cent. 



On the Haybridge run, a mile and a half north of Pemberton, 

 there is very good green marl which is dug near the road. Over 

 this is a thin layer, containing much of the copperas earth in a 

 state of efflorescence. 



At Forsyth's, north of the road between Pemberton and Lis- 

 bon, and one and a half miles from the former place, there is 

 very good dark-green marl, lying on the surface of the meadow. 

 It contains numerous fossils. On the edge of the meadow, and 

 near the top of the marl, there were found, some years ago, the 

 principal portions of the head of a mastodon, and also a tusk, 

 pieces of the tibia, ribs, &c. It would seem, from the state of 

 the bones, and the unworn condition of the teeth, to have been 

 a young one. The head was exposed to the air, lying only 

 eighteen inches below the surface of the meadow, and was much 

 decayed. 



In a ravine, on the edge of the meadow, and lying in the yel- 

 low sand which covers the marl, there was found a mass having 

 all the external characteristics o( retinasphaltum. 



Shark's teeth, phosphate of iron, &c. occur in the marl of this 

 vicinity. 



Birmingham. — The marl is generally of a superior quality 

 along the north branch of the Rancocus, both above and below 

 Birmingham. On the north side of the stream, it is extensively 

 opened on the farm of Jacob Gaskill, where the greensand may 

 be penetrated to a depth of twenty-five feet without serious 

 inconvenience from the infiltration of water into the pits. 



