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Updated: May 10, 2025
None of the beds are of great horizontal extent, and there is much cross- stratification in the sands, and in some places black carbonaceous seams and lignite. In the midst of these leaf-beds in Studland Bay, Purbeck shells of the genus Unio attest the fresh-water origin of the white clay. On the whole, they remind the botanist of the types of subtropical India and Australia.
The formations of Chiloe seem to extend with nearly the same character to Valdivia, and for some leagues northward of it: the underlying rocks are micaceous schists, and are covered up with sandstone and other sedimentary beds, including, as I was assured, in many places layers of lignite.
They might easily have been overlooked or confounded with the general glacial drift of the neighbourhood, had not the bed of lignite, which is from 5 to 12 feet thick, been worked for fuel, during which operation many organic remains came to light. Among these are the teeth of Elephas antiquus, determined by Dr.
The ashes of coals and lignite are also excellent means of ameliorating the soil, and they are used in many places for this purpose. The most suitable may be readily known by their property of forming a gelatinous mass when treated with acids, or by becoming, when mixed with cream of lime, like hydraulic cement, solid and hard as stone.
I visited Utznach in company with M. Escher von der Linth in 1857, and during the same year examined the lignite of Durnten, many miles farther down on the right bank of the lake, in company with Professor Heer and M. Marcou. The beds there are of the same age and within a few feet of the same height above the level of the lake.
Every quarter the owners have to pay a halfpenny per ton on the output, if it be bituminous coal; and a farthing a ton, if it be lignite. Payment is made into the nearest Post Office Savings Bank and goes to the credit of an account called "The Coal Miners' Relief Fund." From 1891 mineral rights are reserved in lands thereafter alienated by the Crown.
There are outcroppings of lignite at numerous points on the island, and in the vicinity of Mt. Halcon is found the finest marble yet discovered in this part of the world. Gold is also present in some quantity at various places. In short, Mindoro is naturally one of the richest islands in the Archipelago.
There are the ruins of five huts on the left bank of the river at its mouth. About a mile and-a-half north-eastward from Naden River, a small creek discharges into the harbor, and two miles beyond. LIGNITE BROOK, with a small island opposite, at high tide.
Were we artificially to prepare a mass of vegetable substance, and covering it up entirely, subject it to great pressure, so that but little of the volatile gases which would be formed could escape, we might in the course of time produce something approaching coal, but whether we obtained lignite, jet, common bituminous coal, or anthracite, would depend upon the possibilities of escape for the gases contained in the mass.
The London clay seems to be unrepresented in the Paris basin, unless partially so, by these sands. At the base of the tertiary system in France are extensive deposits of sands, with occasional beds of clay used for pottery, and called "argile plastique." Layers of lignite also accompany the inferior clays and sands.
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