Identifier: geologicalmagazi521905wood (find matches)
Title: Geological magazine
Year: 1864 (1860s)
Authors: Woodward, Henry, 1832-1921
Subjects: Geology
Publisher: London (etc.) Cambridge University Press
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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nd pro-duced the appearance which has led some observers to the conclusionthat the geysers occurred at that period. 6. The age of the Petrified Forest, the Gebel Ahmar Sands andSandstone, and the associated lava-flows, is undoubtedly Oligocene,as these deposits fall between Eocene and Lower Miocene beds. V.—On a specimen of Cyrtoceras (Melooeras) apicale fromTHE Carboniferous Limestone, Kniveton, Derbyshire. By G. C. Crick, F.G.S., of the British Museum (Natural History). (PLATE III.) rpHE specimen which forms the subject of the present com-JL munication is a fragment of a Nautiloid in the collection ofDr. Wheelton Hind, F.G.S., from the Carboniferous Limestone,Kniveton, Derbyshire, that seems to be referable to Cyrtoceras(Meloceras) apicale. This species, instituted by Dr. Foord in 1898,^ 1 Monograph of the Cai-boniferous Cephalopoda of Ireland (PalseontographicalSociety), pt. ii, 1898, pp. 33-36, pi. xi, figs, la, lb, 2a, 2b, 3 ; pi. xii. Geol. Mag. 1905. Dec. V, Vol. II, PI. III.
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Cyrtoceras (Meloceras) apicale, A. H. Foord.Carboniferous Limestone : Kniveton, Derbyshire. ) ^ \ 64 G. C. Cnclc—On Cyrtocerasfrom Derbyshire. and based upon examples from St. Doulagbs, co. Dublin, Ireland,was cbaracterized as follows :— Sbell of moderate size, rather sbarpl) curved in the lower thirdof the septate portion, but becoming almost straight above this, so-that a fragment consisting only of the upper two-thirds of the shellwould scarcely exhibit any curvature. Upon a chord of 38 mm.subtending the concave side of the apical region of tbe shell thegreatest curvatui^e is 5 mm. The rate of tapering above this curvedpart is about 1:4, which is a rapid increase in diameter. Thesection is very nearly circular, the siphuncle close to the margin ofthe outer curvature of the shell. The body-chamber considerablyexceeds one-third of the length of the entire shell; its basal line isindicated by the letters a, h, in fig. 2 of pi. xii, in which its obliquityis very maiked, making an a

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