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angles appear articular bands base beds belong bones border Boulder-clay boulders breccia calcareous Cambrian Canama Carboniferous centrum character clay cliffs colour conglomerate Conodonts convex Criffel crystalline crystals denticles deposits described Devonian district dorsal evidence exposed feet felsite felspar felspathic felstone Fenestella formation fossils fragments genus Geol Geological glacial glaciers grains granite gravel grey grits havo Hessle Hill hornblende inch Journ length limestone lower M'Coy margin marls mass mica microscope miles millims mineral nearly neural arch neural canal numerous occur Old Red Sandstone pebbles plates porphyritic portion posterior present probably Prof quarry quartz quartz-felsite quartzite resemblance ridge river rocks rounded sand Sandstone schists seen shales shells side Silurian similar slates slope species specimens spine stones strata structure surface teeth thickness Titanosuchus tooth trace transverse Triassic upper valley vertebra volcanic
Page 674 - We may consider the level of the sea to be a grand base level, below which the dry lands cannot be eroded; but we may also have, for local and temporary purposes, other base levels of erosion, which are the levels of the beds of the principal streams which carry away the products of erosion.
Page 389 - They are sometimes filled with boiling water which overflows in the form of a rivulet, while at other times violent ebullition is heard to be taking place at a short distance below the surface. These fissures are lined with a siliceous incrustation, which is being constantly deposited, while a central longitudinal opening allows of the escape of gases, steam, and boiling water. The water is slightly alkaline, and contains carbonate of sodium, sulphate of sodium, common salt, &c. Carbonic acid escapes...
Page 142 - Land., xxxv. 138, for the references to the ran^e of the mammoth. that spot at that time they might have been entombed in the same way, and preserved by the frosts of the winter till they were liberated again by the rare chance of their place of sepulture being invaded by warm floods from the south. The thaw in that year proceeded so rapidly that Lieut. Benkendorf and his Cossacks narrowly escaped the alternative of being entombed in the soft morass, or of being swept out northwards into the Arctic...
Page 68 - Loftusia. ,•The typical and most abundant form of io/fwsi'a-limestono is a pale or dark-grey cryptocrystalline rock, in which the more perfect specimens of Loftusia appear thickly crowded together, as paler spots, generally pretty sharply defined. The limestone breaks freely in any direction, the fracture passing equally through the matrix and included Evidence of great lateral pressure. Compressed and overturned fold«.
Page 423 - Results of a Systematic Survey (in 1878) of the Directions and Limits of Dispersion, Mode of Occurrence, and Relation to Drift-deposita of the Erratic Blocks or Boulders of the West of England and East of Wales, including a Revision of many years
Page 757 - In the caudal vertebrae they are short and robust, and issue from the superior part of the centrum, They do not continue far on the tail. Those of the dorsal vertebrae are light and concave below. They are supported by thin osseous buttresses, the most important of which are the two inferior ones. The anterior of these is much the most prominent, and bears the capitular articular facet for the rib. In no case is this surface seen on the centrum, but it descends somewhat in the posterior vertebras,...
Page 353 - Museum reviewed the evidence on which conodonts had been referred to the fishes and concluded that "they have most analogy with the spines, or booklets, or denticles of naked mollusks or annelides.
Page 354 - Conoids and Elasmobranchs, with a consequent great amount of variation in their structural development, we could hardly judge, from their pauperized descendants of the present day, how far this variation may have extended in former times. We should not therefore, on account of the imperfect analogy of the conodonts with the teeth of the existing Myxinoids, reject altogether the probability that they may have belonged to similar low type of fishes. At present however the facts at hand appear insufficient...
Page 415 - Why are paleolithic river-gravels restricted to the south-east of England, while neolithic remains occur broadcast throughout these islands ? What is the reason for the limitation of the southern mammalia to one small area in the south-east, and why should the mammoth and woolly rhinoceros occur so abundantly in the valley-gravels of that district, while they appear so seldom, and that only at wide intervals, in the valley-gravels of the north? Beyond the palaeolithic area, the great storehouses...
Page 356 - Basal portion straight and narrow; at the anterior extremity is an elongated tapering main tooth, the lower portion of which appears to extend below the front part of the base. On the base are thirteen straight, delicate, pointed denticles nearly uniform in size. Both main tooth and denticles convex in section. Length of main tooth % line, of the horizontal base % line.