10 On the Tertiary Beds of Hor dwell, Hampshire. 



hones. After these clays, succeeds a layer of ironstone from a 

 foot to eighteen inches in depth, and extending in triangular 

 masses of 4 to 5 feet in a horizontal direction. It is not con- 

 tinuous; sometimes several feet will occur without the stones, 

 which are replaced by the same green clay as immediately above. 

 From these to the base of this stratum are dirty green clays, 

 mottled with iron; immediately under the ironstone is a 

 small layer of white sand, which contains much the same bones 

 as are found in the small band of crushed shells lying imme- 

 diately above them, — Trionyx, Emys, Crocodile teeth, Serpents' 

 vertebra, Birds and Fish bones. No large Mammalian bones are 

 found here. Potamomyce and Paludirue are found with them. 

 A small band of lignite runs through the clay about 8 inches 

 after this band. The clays underneath are full of crushed layers 

 of Potamomya, with which are found in a very rotten state, pieces 

 of Trionyx and Emys : crystals of selenite are met with in this 

 bed only. 



Stratum 16 is the first of the fluvio-marine series. It varies 

 from 4 to 5 feet in depth, and commences with a band of lignite 

 so lightly carbonized that it burns like coal. The depth of this 

 is about 18 inches. This is succeeded by a stratum of very dark 

 mottled green and gray clay, about 2 or 3 feet in thickness. 

 Then there is another narrow band of lignite of about 4 

 inches, and under that, 4 to 6 inches of the same clay as 

 above. These clays contain immense numbers of Potamomya 

 much crushed with other shells. The Neritina is only found 

 here and in stratum 17, as well as in stratum 2, or the upper 

 marine. No vertebrate remains whatever are found here. The 

 whole of this stratum (and the lower part of stratum 15) makes 

 a sudden dip near its commencement. The green clay which 

 fills up the lower part of this dip, is curiously mottled with the 

 gray clay immediately above, and the gray portions contain the 

 same shells as the clay above. As this dip occurs at high-water 

 mark, it is generally covered by shingle, but the sea having set 

 in at this spot for above a week in this month (August 1851), 

 has carried away many yards of shingle and cliff, and laid bare, 

 for the first time for years, this singular variation in the stratum. 

 The first week in September I visited this spot again, and in ten 

 days, the whole, to the height of 6 or 8 feet, had been entirely 

 covered with beach again. 



Stratum 17 is about 20 feet in thickness. It consists entirely 

 of sands very variable in colour. It rises about one hundred 

 yards east of Mead End, but owing to being generally covered 

 with beach, is seldom traced there. Its colour on rising is a 

 greenish gray very much like the clays above, but it soon alters 



