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angle appear base beds belong bones British called cells Chalk character classed clay closely Collection common considerable considered consists containing cutting D'Orbigny deposits described developed Diastopora direction district Escharoid forms evidence examined existence fact feet figure formation forms fossils genus Geol Geological give given Hill horizon important island known later length less lids limestone living Lower marked mass Middle miles mountains nature nearly Neocomian observed obtained occur Oolitic opercula origin period plane Plate Polyzoa portion position present preserved probably Prof Professor recent referred regarded region relation remains remarkable represented rocks rounded sand Sandstone says schist seen shales shells side Silurian similar species specimens spirals structure suggested supposed surface Survey thickness trace Upper Wenlock whole
Page 26 - The gravels are more quartzose than is usually the case, and consist of rounded and angular quartz pebbles and boulders of all sizes up to a foot or more in diameter, and flat pebbles of the green countryrock. They range in thickness from five feet down to a few inches, and are overlain by from fifteen to twenty feet of interstratified sand and muck. ' Gold Run Creek is singular in having its most productive part situated towards its mouth. It is possible, however...
Page 71 - The lava of the Henry Mountains behaved differently. Instead of rising through all the beds of the earth's crust, it stopped at a lower horizon, insinuated itself between two strata, and opened for itself a chamber by lifting all the superior beds. In this chamber it congealed, forming a massive body of trap.
Page 408 - ... time-keeping means uniformity of action. But the striking of the clock is essentially a catastrophe ; the hammer might be made to blow up a barrel of gunpowder, or turn on a deluge of water ; and, by proper arrangement, the clock, instead of marking the hours, might strike at all sorts of irregular intervals, never twice alike in the intervals, force, or number of its blows.
Page 153 - Europe and America, have been united at some period not remote geologically, and that seas to the depth of 1,000 fathoms have been bridged over ; but we must treat as "utterly gratuitous and entirely opposed to all the evidences at our command " [! !], the supposition that temperate Europe and temperate America, Australia, and South America, have ever been connected, except by way of the Arctic or Antarctic Circles, and that lands now separated by seas of more than 1,000 fathoms depth have ever been...
Page 363 - Archaean ridge of crystalline rocks which ranged probably from Scandinavia through the central highlands of Scotland, and included the north and west of Ireland, with the counties of Donegal, Derry, Mayo, Sligo, and Galway — in all of which the Cambrian beds were absent, so that the Lower Silurians repose directly and unconformably on the crystalline rocks of Laurentian age.
Page 340 - The articulation of the scapula and coracoid, and the latter with the sternum is characteristic; and the furculum is distinctly avian. The sternum is a single broad plate, well ossified. It probably supported a keel, but this is not exposed in the known specimens. In the wing itself the main interest centers in the manus and its free metacarpals.
Page 119 - J'y ai trouvé un membre postérieur de Rhinocéros dont les os étaient encore dans leur situation relative ordinaire. Ils ont dû être joints par des ligaments et même entourés de muscles à l'époque de leur enfouissement. Le squelette entier du même animal gisait à peu de distance. » J'ai remarqué que toutes les fois qu'on rencontrait des...
Page 249 - Co., 111., which goes far to settle definitely that it was not only a recent animal, but that it survived until the life and vegetation of to-day prevailed. The tusks formed each a full quarter of a circle, were...
Page 225 - Pleuracanthus always possesses a double row of denticles either ranged laterally along the exposed part of the spine or in some position between the lateral and posterior aspects of the spine. It is possible that evidence may be discovered which will render necessary the removal of these spines to the genus Pleuracanthus ; but at present there is no evidence that such is advisable.