. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fusus contrarius. Purpura tetragona. Cyprcea europcea. 150 half nat. size; the others nat. size. Among the bones and teeth of fishes are those of large sharks (Carcharodon), and a gigantic state of the extinct genus Myliobates, and many other forms, some common to our seas, and many foreign to them. It is questionable, however, whether all these can really be ascribed to the era of the Red Crag. Not a few of them may possi- bly have been derived from older strata, es
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fusus contrarius. Purpura tetragona. Cyprcea europcea. 150 half nat. size; the others nat. size. Among the bones and teeth of fishes are those of large sharks (Carcharodon), and a gigantic state of the extinct genus Myliobates, and many other forms, some common to our seas, and many foreign to them. It is questionable, however, whether all these can really be ascribed to the era of the Red Crag. Not a few of them may possi- bly have been derived from older strata, especially from those Lower Miocene formations to be described in the next chapter, which are largely developed in Belgium, and of which a fragment only (the Hempstead beds of Forbes) escaped denudation in England. Many of the fossils found in the Red Crag have been washed out of older Tertiary strata, especially out of the London Clay. This is particularly the case in one of the lower beds, which has of late been much used in agriculture for manure, as containing nodules of phos- phate of lime. These nodules often include crabs and fishes like those of the London Clay, and thus clearly betray the date of their origin. With the nodules (in which there is nearly 60 per cent, of phosphate of lime), occur rolled flint pebbles, and others of sand- stone, containing casts of crag-shells and many ear-bones of whales. Some teeth of the Mastodon arver- Fi°-1M- nensis, and of a rhinoceros and tapir, have also been found in the same bed, which has been worked near Felixstow among other places. As to the ear- bones of cetacea, Professor Henslow found those of two or three distinct Tympanic hone of Balcena emarginata, . , . .. . .. _ .. Owen; Bed Crag, Felixstow. species in this detrital bed at h elixstow. They belong, according to Professor Owen, to true whales of the family Balcenidce (fig. 154). Mr. "Wood is of opinion that they are of the age of the Red Crag, or if not, that they m
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
