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It was before stated that the Miocene formation of Switzerland consisted of, first, the upper fresh-water molasse, comprising the lacustrine marls of Oeningen; secondly, the marine molasse, corresponding in age to the faluns of Touraine; and thirdly, the lower fresh-water molasse. Some of the beds of the marine or middle series reach a height of 2470 feet above the sea.
Following up this idea after he had visited Switzerland and without any communication with M. de Mortillet or cognisance of his views, he suggested in 1859 that the lake-basins were not of pre-glacial date, but had been scooped out by ice during the glacial period, the excavation having for the most part been effected in Miocene sandstone, provincially called, on account of its softness, "molasse."
There are, indeed, so many types among the fossils, both specific and generic, which have a wide range through the whole of the Molasse, that a unity of character is thereby stamped on the whole flora, in spite of the contrast between the plants of the uppermost and lowest formations, or between Oeningen and Monod.
Among the remains of fish in these post-eocene strata of the United States are several large teeth of the shark family, not distinguishable specifically from fossils of the faluns of Touraine. Lower Miocene Strata of France. Line between Miocene and Eocene. Lacustrine Strata of Auvergne. Fossil mammalia of the Limagne d'Auvergne. Lower Molasse of Switzerland.
The second formation is composed of fibrous gypsum, placed either in the molasse or new sandstone, or between this and the upper limestone. It abounds in common clay, which differs essentially from the salzthon or muriatiferous clay. The third formation of gypsum is more recent than chalk. To this belongs the bony gypsum of Paris; and, as appears from the researches of Mr.
I have even observed that they resemble astonishingly the forests of the Molasse epoch, and the analogy is heightened by that between the animals of this country and those of the eastern coasts of Asia as compared with those of the Molasse, such as the chelydras, andreas, etc. I will send a report upon this to M. Brongniart as soon as I have the time to prepare it.
The total number of mammalia enumerated by M. Pomel as appertaining to the Lower Miocene fauna of the Limagne and Velay falls little short of a hundred, and with them are associated some large crocodiles and tortoises, and some Ophidian and Batrachian reptiles. The two upper divisions of the Swiss Molasse the one fresh-water, the other marine have already been described in the preceding chapter.
Even in the Superga itself there are some fossil plants which, according to Heer, have never been found in Switzerland so high as the marine Molasse, such as Banksia longifolia, and Carpinus grandis.
And, because it is well at once to know some direction in which our work may be definite, let me suggest to those of you who may intend passing their vacation in Switzerland, and who care about mountains, that if they will first qualify themselves to take angles of position and elevation with correctness, and to draw outlines with approximate fidelity, there are a series of problems of the highest interest to be worked out on the southern edge of the Swiss plain, in the study of the relations of its molasse beds to the rocks which are characteristically developed in the chain of the Stockhorn, Beatenberg, Pilate, Mythen above Schwytz, and High Sentis of Appenzell, the pursuit of which may lead them into many pleasant, as well as creditably dangerous, walks, and curious discoveries; and will be good for the discipline of their fingers in the pencilling of crag form.
The Miocene formations of Switzerland have been called MOLASSE, a term derived from the French MOL, and applied to a SOFT, incoherent, greenish sandstone, occupying the country between the Alps and the Jura. This molasse comprises three divisions, of which the middle one is marine, and being closely related by its shells to the faluns of Touraine, may be classed as Upper Miocene.
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