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of them sauroid and therefore predaceous. The most 
remarkable paleontological feature is the abundance of 
vegetable growth, a great part of which is now converted 
into coal. The gigantic Sigillaria, Lepidodendon, Cala- 
mites, and tree ferns indicate a moist and tropical climate, 
which in most cases grew near the spot, and in others 
were drifted into the estuaries and lakes of the period, 
and, as in the former case, associated with esturian shells. 
The fossils in the Warwickshire carboniferous series have 
not been diligently searched for, if they were, we should 
probably obtain here, as elsewhere, a larger and more 
abundant flora and fauna, which recent researches have 
brought to light in connection with the life of this epoch 
in other places, and have yielded some very remarkable 
and interesting results. 
The millstone grit, so termed from its use for millstones, 
is a hard, altered, siliceous quartz rock, traversed more or 
less by intrusive greenstone, and is the lowest part of 
the carboniferous formation in this county. It is promi- 
nently exposed in a high ridge between Nuneaton and 
Atherstone, only for a few miles in extent. No fossils are 
known in it here, and where found are chiefly coal plants 
and a few shells, in the form of casts. 
In conclusion it is desirable briefly to give a sketch, 
partly a recapitulation, of the history of the five Geologi- 
cal periods described in this Paper. The most recent of 
these are the drifts of fine gravel, sand, and boulders, 
which are irregularly spread over many parts of the 
county. In the earliest of these we have evidence of 
the existence of many extinct mammalia, such as the 
elephant, hippopotamus, rhinoceros, tiger, bear, hyena, 
cave lion, gigantic deer, extinct horse, and many others. 
In the next no such remains have been met with, but 
it is remarkable as one of excessive cold, in which ice 
