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30-feet bed appears bed of shale Boulder-clay carbonate of lime Carboniferous Limestone Cherty Cheshire Chrysocolla clay Coal colour containing Corwen crystals denudation deposits depth described district Drift earth east Eed Sandstone Eglwyseg Eglwyseg ridge Eoad Eocks evidence exposed fault felspar Flint formation formed fossils Geol Geological Survey Glacier Granite gravel inches Journ Lancashire land Liverpool Llangollen Llanymynech Llawnt lodes lower beds Lower Brown Limestone Lower White Limestone M'Coy Mersey mica Millstone Grit mineral Morton mountains North Wales occur Oswestry outcrop pebbles Phil present probably Proc Productus Prof quartz remarkable river rocks sand Sandy Limestone Shale shells Silurian solids in solution species square mile stone strata Street striated subdivision sulphate surface Survey Map Sweeney Mountain thin beds tons Treflach Triassic Ty-nant Ty-nant ravine upper beds Upper Grey Limestone Upper White Limestone valley volcanic Wenlock White Sandstone
Seite 365 - In the time of the Romans the Danish Isles were covered, as now, with magnificent beech forests. Nowhere in the world does this tree flourish more luxuriantly than in Denmark, and eighteen centuries seem to have done little or nothing towards modifying the character of the forest vegetation. Yet in the antecedent bronze period there were no beech trees, or at most but a few stragglers, the country being then covered with oak. In the age of stone again, the Scotch fir prevailed (see p.
Seite 225 - If we allot 50 tons to carbonate of lime, 20 tons to sulphate of lime, 7 to silica, 4 to carbonate of magnesia, 4 to sulphate of magnesia, 1 to peroxide of iron, 8 to chloride of sodium, and 6 to the alkaline carbonates and sulphates we shall probably be as near the truth as present data will allow us to come.''* By the use of the data given by Mr.
Seite 251 - ... form of sub-glacial rivers. These sub-glacial rivers are familiar in all Alpine countries, and in Greenland pour out from beneath the glacier, whether it lies at the sea or in a valley, and in summer and winter.
Seite 60 - It is hardly necessary for me to call your attention to the fact that, by far, the greater proportion of rocks * Siluria, pp.
Seite 365 - Thus, in Mar forest, in Aberdeenshire, large trunks of Scotch fir, which had fallen from age and decay, were soon immured in peat formed partly out of their perishing leaves and branches, and in part from the growth of other plants.
Seite 334 - When there has been no reason to suppose that the trawl has sunk more than one or two inches in the clay, we have had in the bag over a hundred sharks' teeth, and between thirty and forty ear-bones of whales.
Seite 4 - Stones and boulders alike are scattered higgledy-piggledy, pell-mell, through the clay, so as to give to the whole deposit a highly confused and tumultuous appearance. There is something very peculiar about the shape of the stones. They are neither round and oval, like the pebbles in river gravel, or the shingle of the sea shore, nor are they sharply angular, like newly-fallen debris at the base of a cliff, although they more closely resemble the latter than the former. They are, indeed, angular...
Seite 27 - ... little potash to the water before adding the Nessler test. Thus, in estimating the ammonia in the distillate from soda water, too small a number will be obtained, if this precaution be neglected. When there is a necessity for the use of the Nessler test without previous distillation, a special device has to be resorted to. in order to get rid of the disturbing influence on the Nessler test of the substances dissolved. Thus : — Take 500 cc of water, add a few drops of solution of chloride of...
Seite 4 - Their shape, as will be seen, is by no means their most striking peculiarity. Each is smoothed, polished, and covered with striae or scratches, some of which are delicate as the lines traced by an etching-needle, others deep and harsh as the scores made by the plow upon a rock. And, what is...
Seite 365 - At Tierra del Fuego almost all plants contribute by their decay to the production of peat, even the grasses ; but it is a singular fact, says Mr. Darwin, as contrasted with what occurs in Europe, that no kind of moss enters into the composition of the South American peat, which is formed by many plants, but chiefly by that called by Brown, Astelia Pumila.