United States or Western Sahara ? Vote for the TOP Country of the Week !
Walchia piniformis, Schloth. Permian, Saxony. Branch. b. Twig of the same. c. About 18 or 20 species of plants are known in the Permian rocks of England. None of them pass down into the Carboniferous series, but several genera, such as Alethopteris, Neuropteris, Walchia, and Ullmania, are common to the two groups.
There are 25 Gasteropods and only one cephalopod, Nautilus Freieslebeni, which is also found in the German Zechstein. Spirifera alata, Schloth. Syn. Trigonotreta undulata, Sowerby., King's Monograph. King and Howse.
It affords the thickest stratum of pure vegetable matter hitherto detected in any secondary rock in England. One seam of coal of good quality has been worked three and a half feet thick, and there are several feet more of pyritous coal resting upon it. Terebratula fimbria, Sowerby. Inferior Oolite marl. Rhynchonella spinosa, Schloth. Pholadomya fidicula, Sowerby. One-third natural size.
The middle division of the Speeton clay, occurring at Speeton below the cement- bed, before alluded to, is 150 feet thick, and contains about 39 species of mollusca, half of which are common to the overlying clay. Ammonites Noricus, Schloth.
In illustration of shells having a great vertical range, it may be stated that in England some few species pass up from the Lower to the Upper Oolite, as, for example, Rhynchonella obsoleta, Lithodomus inclusus, Pholadomya ovalis, and Trigonia costata. Ammonites macrocephalus, Schloth. One-third natural size.
Ceratites nodosus, Schloth. Muschelkalk, Germany. The next member of the Trias in Germany, the Muschelkalk, which underlies the Keuper before described, consists chiefly of a compact greyish limestone, but includes beds of dolomite in many places, together with gypsum and rock-salt. This limestone, a formation wholly unrepresented in England, abounds in fossil shells, as the name implies.
Word Of The Day