United States or Saudi Arabia ? Vote for the TOP Country of the Week !
In the new southern ocean another branch of these Thalamophores, the Nummulites, spreads with such portentous abundance that its shells sometimes alone, generally with other material make beds of solid limestone several thousand feet in thickness. The pyramids are built of this nummulitic limestone. The one-celled animal in its shell is, however, no longer a microscopic grain.
It has been observed not only in Cutch, but in the mountain ranges which separate Scinde from Persia, and which form the passes leading to Caboul; and it has been followed still farther eastward into India, as far as eastern Bengal and the frontiers of China. Nummulites Puschi, D'Archiac. Peyrehorade, Pyrenees. a.
Shells, Nummulites, Fish and Reptiles of the Bracklesham Beds and Bagshot Sands. Plants of Alum Bay and Bournemouth. Lower Eocene of England. London Clay Fossils. Woolwich and Reading Beds formerly called "Plastic Clay." Fluviatile Beds underlying Deep-sea Strata. Thanet Sands. Upper Eocene Strata of France. Gypseous Series of Montmartre and Extinct Quadrupeds. Fossil Footprints in Paris Gypsum.
It partakes of the character both of the Cretaceous Belemnites and of the living Cuttle-Fish, and is known as the Spirulirostra. Another very characteristic group among the Tertiary Shells is that of the Nummulites, formerly placed by naturalists in immediate proximity with the Ammonites, on account of their internal partitions.
It appears that of more than fifty species of these foraminifera described by D'Archiac, one or two species only are found in other tertiary formations whether of older or newer date. Nummulites intermedia, a Middle Eocene form, ascends into the Lower Miocene, but it seems doubtful whether any species descends to the level of the London clay, still less to the Argile plastique or Woolwich beds.
Word Of The Day