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Updated: May 4, 2025
As long as most of the links between any two species are unknown, if any one link or intermediate variety be discovered, it will simply be classed as another and distinct species. Only a small portion of the world has been geologically explored. Only organic beings of certain classes can be preserved in a fossil condition, at least in any great number.
Although we are far from being able to demonstrate geologically an insensible transition from the Eocene to the Miocene, or even from the latter to the recent fauna, yet the more we enlarge and perfect our general survey, the more nearly do we approximate to such a continuous series, and the more gradually are we conducted from times when many of the genera and nearly all the species were extinct, to those in which scarcely a single species flourished which we do not know to exist at present.
He told Birt that he was a professor of Natural Science in a college in one of the "valley towns," and that he was sojourning, for his health's sake, at a little watering-place some twelve miles distant on the bench of the mountain. Occasionally he made an excursion into the range, which was peculiarly interesting geologically. "But what I wish you to do is to dig for bones."
Seeing every height crowned with its crater, and the boundaries of most of the lava-streams still distinct, we are led to believe that within a period geologically recent the unbroken ocean was here spread out. Hence, both in space and time, we seem to be brought somewhat near to that great fact that mystery of mysteries the first appearance of new beings on this earth.
Geologically speaking, the Carboniferous formation occurs near the close of that group of systems which have been classed as "palaeozoic," younger in point of age than the well known Devonian and Old Red Sandstone strata, but older by far than the Oolites, the Wealden, or the Cretaceous strata.
"I hear from some of the men that you have been able to do some prospecting in the last weeks, Mr. Everett," remarked the Senator casually from behind the veil, as he accepted and lighted a cigar. "Just knocked around a bit," answered Everett carelessly. "The whole Mississippi Valley is interesting geologically. There is quite a promise of oil here, but practically no outcrop."
Quantocks, The, a range of hills forming the W. boundary of the spacious plain which occupies the centre of the county. Geologically, they belong to the Devonian series of rocks. Their tops are covered with bracken, heather, scrub oak, and quantities of whortle berries, the ripening of the last marking the beginning of the summer holidays for the village children, who then go "whorting."
The question of the harbor of Boston, for instance, has a geological and zoological side, thus far only indirectly considered. In order to ascertain whence the materials are derived which accumulate in the harbor, the shores ought to be studied geologically with a kind of accuracy and minuteness, never required by geological surveys made for economical purposes.
When we consider geologically the basin of the Caribbean Sea, and of the Gulf of Mexico, we find it bounded on the south by the coast-chain of Venezuela and the Cordilleras of Merida and Pamplona; on the east by the mountains of the West India Islands, and the Alleghanies; on the west by the Andes of Mexico, and the Rocky Mountains; and on the north by the very inconsiderable elevations which separate the Canadian lakes from the rivers which flow into the Mississippi.
Only a small portion of the surface of the earth has been geologically explored, and no part with sufficient care, as the important discoveries made every year in Europe prove. No organism wholly soft can be preserved. Shells and bones decay and disappear when left on the bottom of the sea, where sediment is not accumulating.
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