Fossils
The Yoredale limestones are characterized by the presence of Productus giganteus and the brachiopod fauna usually associated with it. The main limestone of Weardale is full of corals, including Lonsdaleia floriformis, Dibunophyllum sp., Cyclophyllum pachyendothecum, etc., and has a typical Visean fauna; it would therefore correspond, palaeontologically, with the upper part of the Carboniferous Limestone of Derbyshire.
On Ingleborough the limestone is not very fossiliferous, but the Main Limestone contains small corals of a zaphrentoid type and an upper Visean fauna. Posidonomya Becheri occurs fairly low down in the series in the Shale above the Hardraw Scar and Gayle limestones, but it is not accompanied by any of the goniatites or other cephalopods and lamellibranchs which characterize the Posidonomya Becheri beds of the Pendleside Series, the faunas of the Yoredale and Pendleside phases being very distinct.
The Red Bed Limestone of Leyburn, the uppermost limestone of the series, is very rich in fish remains, which are identical in many cases with those found in the topmost beds of the massive Carboniferous Limestone at Bolt Edge quarry in Derbyshire. The shales between the limestones are rich in fossils and contain abundant single corals referable to Zaphrentis enniskilleni, Cyclophyllum pachyendothecum, and others; these, though high-zonal forms, occur low down in the Yoredale strata, even in the shale above the Hardraw Scar limestone. In the Derbyshire area and farther north these corals would indicate the uppermost beds of the limestone series of those districts, and their early appearance in the Yoredale area is probably entirely due to conditions of environment.
Attempts have been made to correlate rocks in a number of widely separated areas with the Yoredale strata, but on wholly insufficient grounds. It is clear that the exact relationship which the Yoredale series of the type area bears as a whole to the lower Carboniferous rocks of the Midlands, north and south Wales, etc., on the one hand, and to the Pendleside series on the other, has yet to be established on a firm palaeontological basis.
Read more about this topic: Yoredale Series
Famous quotes containing the word fossils:
“You can hardly convince a man of an error in a life-time, but must content yourself with the reflection that the progress of science is slow. If he is not convinced, his grandchildren may be. The geologists tell us that it took one hundred years to prove that fossils are organic, and one hundred and fifty more to prove that they are not to be referred to the Noachian deluge.”
—Henry David Thoreau (1817–1862)
“In early times, before the floods swept across the world, there was life, albeit odd, as one can see from the fossils of mammoth bones, and there was the regime of Prince Metternich.”
—Franz Grillparzer (1791–1872)