from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects
Sorry, no etymologies found.
At the extreme south end, between Kilchattan and Garroch Head, these conglomerates and sandstones are overlaid by a thick cornstone or dolomitic limestone marking the upper limit of the formation, which is surmounted by the cement-stones and contemporaneous lavas of Lower Carboniferous age.
The Lower Carboniferous source rocks are Visean organic rich marls and shales.
In the USGS World Petroleum Assessment 2000, geologist G.F. Ulmishek states that the Dneiper-Donetsk hydrocarbons have been classified into two oil families, which have their source in two different rock suites in the Upper Devonian and Lower Carboniferous sections.
In the gravel, a small boulder was found containing fossils, which have been identified by Mr.E. O. Ulrich as belonging to the Lower Carboniferous.
Plant microfossils from the Upper Devonian and Lower Carboniferous of the Canning Basin, Western Australia.