Note-book of an Amateur GeologistLongmans, Green, 1881 - 90 pages |
Contents
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Common terms and phrases
Ammonites annexed woodcut appears bed of trap Bone bed boulders Büdesheim called cave Cephalaspis characters chiefly clay cliff coloured columnar CONTORTED Cove cracks crag crater Devonian Devonian beds Devonian limestone diagram dike district drawn DUNLUCE CASTLE Eifel examined false bedding Faxoe feet flint foot formation fossils Geological geologists give glacier Goniatites Görner glacier granite gravel greensand ground plan GURNARD'S HEAD iguanodon inches Inoceramus JULY junction lake lava limestone lines Llandeilo locality lower Ludlow MacCoy marl mass moraines MOUNT SORACTE mountain natural arch nearly horizontal neighbourhood Nethan Water obtained Old Red Sandstone peculiar pillars PLATE probably quarry Quenst represents road rock rough sketch rubbly Saltern sand sandy saurian scales Schistes seen SEPR SEPT shale shells shows side Silurian singular species specimen Spongia Stein stone surface taken thick Thoresway Torquay Trap Dike Upper Devonian valley wealden weathered Wenlock Whitish
Popular passages
Page 10 - Marl. The edge of the chalk in this district, instead of forming large, rounded, prominent hills, as in Yorkshire, and several parts of Lincolnshire, appears as a thin nearly horizontal bed, spread over the inferior strata, and capping the hills, of which it forms but an inconsiderable portion. For the distance of about a mile or a mile and a half from the outcrop, it forms a platform, nearly horizontal, running north and south, from which on each side a series of valleys run east and west: those...
Page 13 - the interesting remains of Spongice are nowhere so well developed as in England, and perhaps nowhere in England, so well as in Yorkshire. On the shore near Bridlington, they lie exposed in the cliffs and scars, and being seldom enclosed in flint, allow their organization to be studied with the greatest advantage.
Page 14 - Spongite are very abundant along the whole face of the cliff : a great variety of globular specimens may be obtained, from the size of a small pea to that of a common nut ; the form then becomes rather conical, and there are often appearances of a process of attachment. — As they increase in size the specific characters gradually develope themselves ; but the young specimens as well as the old, are subject to great variety in character. Some of the cup-shaped sponges attain a large size ; I have...
Page 9 - ... which have suffered no interruption from the changes made at the Meteorological Office, the astronomical results are more numerous than in previous years. The Sun has received the most attention, in order that the rapidly changing phenomena of its surface may be studied with the greatest accuracy. A paper on this subject was read at the meeting of the American Association at Philadelphia. Two hundred and eighty-one drawings of the entire solar disk were made during the year on 257 different days,...
Page 16 - Fig. 14 represents a portion of the covering very highly magnified. From the singularity of this appearance, the animal might almost be supposed to belong to a very different class from that of the sponges, and the associated genera ; so at least it appeared to me, till, being anxious to see more of the internal structure, I had the specimen cut through, just below the plates figured in "the last diagram : an irregular fibrous structure then became visible, similar to that shewn in (ji-g. 12.) with...
Page 14 - ... appearance. Fig. 2. The shape of this species is very regular, as will be seen from the annexed figure, (Jig. 2.) ; the original is seven inches in length : the stem is pierced by a single canal, for about an inch and a half from the bottom : about an inch higher, four or five principal canals, and several smaller ones shew them: L ~_-m selves ; the subjoined sketch, (Jig.
Page 14 - ... a lessf size than the rest of the fossil, and forms a'sort of crown. The specimen figured is considerably compressed, so that in the sketch it appears broader in proportion to its length than it would have done had it been of its natural form. This species is rare : besides the specimen from which the above description was taken, I have only met with two or three fragments.
Page 11 - ... grey stone. Wherever any good section of' this bed has been obtained, it uniformly is observed to retain the same characters. In Nettleton Valley it becomes very thin, and in some places is almost lost. No traces of fossils have yet been found in it, though we examined it very carefully. Grey Stone is the term which has been provincially given to the bed which underlies the Thoresway sand ; and the name has been retained for want of a better : it will be seen from the map that it forms the brow...
Page 15 - This beautiful species appears to be extremely rare: besides the specimen represented by the figure, (Jig. 9.) I have only met with two or three fragments, which still were sufficient to convince me that the above characters were not accidental : the length of the...
Page 15 - ... thought premature, to consider it a new species. Nothing can be said respecting the length of the stem, as it had unfortunately been lost when the specimen was taken from the face of the cliff: the whole body is covered with irregular depressions, which on the superior surface, and in the...