. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Chalk Bluffs of Trimmingham. 309 the majority are only half silicified, being hollow or partly rilled with a grey chalky matter, which is gritty to the touch and is full of sponge-spicules and minute organisms. The flints are moreo ver surrounded with similar greyish chalk, which sometimes forms a band connecting two or more together;. Northern Bluff, Trimmingham, 1875. this greyish chalk also occurs in places without enclosing any flinty matter, and gives a mottled appearance
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Chalk Bluffs of Trimmingham. 309 the majority are only half silicified, being hollow or partly rilled with a grey chalky matter, which is gritty to the touch and is full of sponge-spicules and minute organisms. The flints are moreo ver surrounded with similar greyish chalk, which sometimes forms a band connecting two or more together;. Northern Bluff, Trimmingham, 1875. this greyish chalk also occurs in places without enclosing any flinty matter, and gives a mottled appearance to the mass. Between the layers of flint nodules the rock is full of a small curved species of oyster (since identified as Ostrea lunata, Nilss.) ; Belemnitella mucronata is also common ; and there are many other fossils (see posteh) ; but the best specimens are adherent to the flints. If the measurements above given be compared with those of Sir Charles Lyell, and the mass in its present state (fig. 1) be compared with the figure in the early editions of the c Principles of Geology' (reproduced in fig. 2), it will be seen that it has now only one third of the length it possessed in 1839. Originally the front face seems to have exhibited a complete synclinal curve, with more than half of the corre- sponding anticlinal at the southern end; but now only the centre of the synclinal is left, the beds rising very slightly to the southern, and more decidedly towards the northern end. With regard to the dip of the beds as viewed from the sides some difference of opinion has existed. It is seldom, indeed, that a clear section is presented by the side face ; for the chalk. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
