Identifier: annualreport5741903newy (find matches)
Title: Annual report
Year: 1902 (1900s)
Authors: New York State Museum
Subjects: New York State Museum Science Science
Publisher: Albany : University of the State of New York
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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iluric, leaving but a few stragglers (four species inNorth America) in the Devonic.1 For this reason they can be considered aclass of organisms most characteristic of the Champlainic and Siluric eras. During the period of their greatest vitality they attained a remarkablerapidity of development, which has permitted the division of the graptoliteshales of several regions into a great number of life zones. This is notablythe case in certain parts of Sweden, where, for instance, Tullberg cites fromScania (1882) no less than 26 graptolite zones of the Lower and Upper Siluric.This fact, together with the discovery brought out by investigations inGreat Britain, France, America and Australia, that the larger division? hurley has also described a fossil from the Choteau limestone (Carboniferous) ofSedalia Mo. as Dictyonema blairi. This, however, is very doubtful and accordingto last accounts only the remains of a plant. Chart of the World showing the Distribution of the Lower Graptolite Fauna
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I and areas it the beginning of the Clianrplain (Lower Silurio) era in drub lint: their boundaries < witli some alterations, horn Freeh (1807) ■ Localities ol r. with Dictyoi a flabelliforme a •■ •■ Tetrngraptus-PhyllnP!118 ™«s (zones i and 3 of Deep kill section) ■■ zone with Diplograptus dentatus (zone 3 of Deep kill section)* •■ • Goniograpt»s thareaui GRAPTOLITES OF NEW YORK, PART 1 489 can be recognized over immense areas, has given to the graptolites theirwell known reputation as reliable indicators of homotaxial beds. It is themerit of Linnarsson, Tornquist and Tullberg in Sweden, and of Lap worth inGreat Britain to have brought into general recognition the fact of the possiblecorrelation of the graptolite beds in different regions, and of their subjectionto the general law of progress and development of the organic world, andthus to have freed them from the bane of suspicion which the theory ofcolonies, promulgated by Barrande, had brought on all cor

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