Werke: [Varia. Atlas des Erdmagnetismus]

Gauß, Carl Friedrich

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Multivolume work

Persistent identifier:: 897435990

Author:: Gauß, Carl Friedrich

Title:: Werke

Type of content:: Aufsatzsammlung

Year of publication:: 1863

Place of publication:: Berlin

Publisher of the original:: Gedruckt in der Dieterischen Universitäts-Druckerei W. Fr. Kaestner

Identifier (digital):: 897435990

Language:: Latin

Additional Notes:: Bände 1-12 erschienen von 1863-1933

Document type:: Multivolume work

Volume

Persistent identifier:: 89768883X

Author:: Gauß, Carl Friedrich

Title:: [Varia. Atlas des Erdmagnetismus]

Scope:: 415 Seiten, XVIII, 8 ungezählte Blätter

Type of content:: Aufsatzsammlung; Atlas

DOI:: 10.14463/GBV:89768883X

Year of publication:: 1929

Place of publication:: Berlin

Publisher of the original:: In Kommission bei Julius Springer

Identifier (digital):: 89768883X

Illustration:: Illustrationen

Signature of the source:: Mr.I 2821(12)

Language:: German

Usage licence:: Public Domain Mark 1.0

Editor:: Gesellschaft der Wissenschaften zu Göttingen

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2017

Document type:: Volume

Collection:: Mathematics

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Document type:: Multivolume work

Structure type:: Cover

Labrador. These are followed by the upper Leda cl 2Q &8 PRINCIPLES { OF STRATIGRAPHY existed. This period seems to have been characterized by subsi- dence. A period of elevation followed, with an increase in warmth, which reached its maximum when the land stood approximately 10 meters higher than at present. This is shown by the boreal mol- luscs Zirphea crispata and Anomia ephip pium, together with Mytilus edulis, Tellina baltica, Littoring rudis, and L. palliata, mostly forms now common on the New England coast. With stil] greater eleva- tion the climate again cooled, until it resembled that of the present time, the maximum elevation being 50 meters above the present sea- level. The first two formations probably were deposited during glacial time, while the succeeding deposits represent post-glacial time. The warm-water fauna has a wide distribution in the arctic, espe- cially recognizable by the shells of Mytilus edulis, and often by Cyprina islandica and Littoripg littorea. Some of the arctic locali- ties where this fauna has been found fossil are the Franz Josef fjord, East Greenland, Spitzbergen, King Charles Land and Franz Josef Land. It has not yet been found in arctic North Americ Another fauna, found in parts of the arctic where it is now ex- tinct, and indicating warmer conditions than now, is the Purpura fauna,- with P, lapillus, Pecten islandicus, Zirphea crispata, Cy- amivm minutum and Skenea planorbis. This has been found in northwestern Iceland, in a formation resting in some cases directly upon the peat beds with remains of the arctic birch, Betula odorata. In North Germany a climate similar to the arctic one is indicated by late glacial or early post-glacial deposits, carrying the molluscs, Vertigo paracedentata, Succinea schumacheri, Planorbis arcticus, P. stroemi, Spherium duplicatum and Anodontq mutabilis. Arctic conditions in Denmark and Sweden, while the ice still occupied a part of the land, are indicated by deposits containing at the base a fauna with the arctic molluscs, Yoldia arctica, Tellina torells, and T. loveni, which at present are restricted to seas where the tem- perature in the depths at which the species live scarcely rises above 215 @8 5hd frequently remains below 0° even in the warmest months of the year. This corresponded to the time of the Salix polaris flora in Denmark. Higher up, together with a flora in which the birches predominate, occurs Anodonta cygnea, which has been held to indicate a July temperature of I3 to e Vst higher follows the fauna with Zirphea crispa, M Ytilus edulis, Cyprina islandica, etc. In northern New England and eastern Canada, the glacial till is followed by the lower Leda clays, the fauna of which (Le Saxicava rugosa, etc.) indicates a climate like that of SO a5 da sp., uthern ays and sands

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