4.04 HIPPOPOTAMUS. 
My. Parkinson lastly cites the remarkable discovery by 
Mr. Trimmer of the remains of the Hippopotamus in the 
fresh-water deposits at Brentford, an account of which 
Mr. Trimmer afterwards communicated to the Royal So- 
ciety,* with excellent figures of the principal fossils of the 
Hippopotamus, and of those of the Mammoth, Rhinoceros, 
and large Deer therewith associated. These specimens were 
collected in two brick-fields ; the first about half a mile 
north of the Thames at Kew Bridge, and with its surface 
about twenty-five feet above that river at low water. The 
strata here are,—first, sandy loam, from six to seven feet, 
the lowest two feet slightly calcareous; this yields no 
organic remains. Second, sandy gravel a few inches 
thick, with fluviatile shells and a few bones of land 
animals. Third, loam, slightly calcareous, from one to 
five feet; between this and the next stratum peat fre- 
quently intervenes in small patches of only a few yards 
wide and a few inches thick: here bones and horns of 
Ox and Deer occur, with fresh-water shells. Fourth, 
gravel containing water; this stratum varies from two 
to ten feet in thickness, and is always deepest in the 
places covered by peat: in it were found the remains of 
the Mammoth, teeth of the Hippopotamus, and horns 
and teeth of the Aurochs. This stratum, like the fresh- 
water deposits at Clacton with similar Mammalian fossils, 
rests upon the eocene London clay, the fossils of which, 
with a few exceptions are, as Mr. Trimmer correctly 
observes, ‘“‘ entirely marine.” The first stratum in the 
second brick-field is a sandy loam, calcareous at its lower 
part, eight or nine feet thick, in which no organic remains 
were observed. In the second stratum, consisting of sand, 
becoming coarser towards the lowest part, and ending in 
* * Philosophical Transactions,’ 1813, p. 131. 
