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Updated: August 13, 2024
To the north-west, in a hollow containing water which drains from beneath the part ignited, is a coarse sandstone, in some places highly charged with decomposed felspar, and containing impressions of spirifers.
Professor Forbes remarks that this fossil resembles several carboniferous limestone Spirifers; and that it is also related to some liassic species, as S. Wolcotii.
If, however, the species from Las Amolanas, in the Valley of Copiapo, had, as in the case of those from Guasco, been separately examined, they would probably have been ranked as oolitic; for, although no Spirifers were found here, all the other species, with the exception of the Pecten, Turritella, and Astarte, have a more ancient aspect than cretaceous forms.
The Spirifer Sandstone of Sandberger, as exhibited in the rocks bordering the Rhine between Coblentz and Caub, belong to this Lower division, and the same broad-winged Spirifers distinguish the Devonian strata of North America. Homalonotus armatus, Burmeister. Lower Devonian; Daun, in the Eifel; and S. Devon. Obs.
There are also traces of casts of Spirifers, one of which is near to S. Pisum of the Wenlock rocks. The description here given is deduced from the natural appearances under the lens, and not from artificial or regular sections.
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