Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Trigonia eaudata, Agass. Lower Greensand. Terebratula sella, Sow. Lower Greensand. Wilts. This genus is closely allied to Chama, and the cast of the interior has been compared to the horns of a goat. The same shell has been referred by some authors to Caprotina, and by others to Requienia. Fig. 336. Diceras Lonsdalii. a. The bivalve shell. Lower Greensand, Wilts. 5. Cast of the same. Palmontological relation of t
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Trigonia eaudata, Agass. Lower Greensand. Terebratula sella, Sow. Lower Greensand. Wilts. This genus is closely allied to Chama, and the cast of the interior has been compared to the horns of a goat. The same shell has been referred by some authors to Caprotina, and by others to Requienia. Fig. 336. Diceras Lonsdalii. a. The bivalve shell. Lower Greensand, Wilts. 5. Cast of the same. Palmontological relation of the Upper and Lower Cretaceous RocTcs. —Professor Ramsay has deduced from an analysis of tables drawn up by Mr. Etheridge of the fossilsof the Cretaceous series of Great Britain the following conclusions :—First, that a great number of species are common to the different subdivisions of the Upper Cretaceous group, such as the Gault, Upper Greensand, White Chalk, &c. Secondly, that there is a great break between the Lower and Upper Cretaceous series, for of 280 species of all kinds of animal remains known in the Lower Cretaceous, 233 are peculiar, and 51, or only about 18 per cent., pass from the Lower Greensand to the Gault and overlying strata. The same geologist adds: ' This break and disappearance of so many species in succession is accompanied by a stratigraphical break as well; for round the Weald it is known that in some of the very few exposures of junctions the Gault has been seen lying on eroded surfaces of Lower Greensand, while in the western and middle parts of England, on the west and north of the great chalk escarpment, the frequent and sudden overlaps of the Lower Greensand by the
Size: 1845px × 1084px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
