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Roth, F. & K. Hoedemakers

Used

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From: Hermann L. Strack (Loguivy Plougras, France)

Seller Rating: 5-star rating

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About this Item: 2005. eds. 190 p., 32 figs, 3 tables, 16 pls, 4to, paperbound. Palaeontos 7. Seller Inventory # PM13401

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Roth, F. & K. Hoedemakers

Used

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From: Hermann L. Strack (Loguivy Plougras, France)

Seller Rating: 5-star rating

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About this Item: 2005. eds. 190 p., 32 figs, 3 tables, 16 pls, 4to, paperbound. Palaeontos 7. Seller Inventory # MM23389

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Roth, F. & Hoedemakers, K. [ed.]

Used Softcover

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From: ConchBooks (Harxheim, Germany)

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About this Item: 2005. 1) Rasmussen, E.S.: The geology of the upper Middle - Upper Miocene Gram Formation in the Danish area. 14 textpages, 10 textfigures Summary: Sediments of the upper Middle - Upper Miocene Gram Formation are distributed in central, west and south Jylland, Denmark. The Gram Formation is subdivided into three units: bottom to top the glaucony-rich, lowermost part, the Gram Clay, and the Gram sand. The sediments of the Gram Formation were deposited in an open marine depositional environment. The sediments of the Gram Formation were deposited in an open-marine environment. The glaucony-rich part was laid down under maximum transgression of the sea during the late Middle Miocene, when the north-eastern boundary of the North Sea was possibly located near the Sorgenfrei-Tornquist Zone in northern Jylland and Skåne. Water depths were up to 100 m in the area covered by the present-day west Jylland, but exceeded 500 m in the central part of the North Sea. In the Upper Miocene, outbuilding of clastic sedimentary wedges from the Fennoscandian Shield occurred from both the north and east. This resulted in a high sedimentation rate during the deposition of the Gram Clay. Locally, especially around salt structures, deeper, partly anoxic, restricted depositional environments prevailed. Expansion of these anoxic environments may have resulted in extreme environmental conditions and resulted in mass mortality shown by well-defined concretion horizons containing impressions of crabs. The uppermost part of the Gram Clay, with fine-grained storm-sand layers, and the Gram sand indicate periodical proximity of the shoreline. Possibly as a result of increased subsidence of the North Sea Basin in the Upper Miocene, up to 400 m of mainly shelfal deposits were laid down in most parts of the eastern North Sea Basin. 2) Beyer, C.: A magnetic analysis of the Late Miocene Gram Formation, Denmark. 10 textpages, 8 textfigures Summary: Based on the assumption that the geomagnetic secular variation in the Late Miocene possessed characteristics similar to the Quaternary secular variation, the accumulation rates of the Miocene Gram Formation was estimated by a magnetic analysis of a 16m vertical profile. The magnetic susceptibility, intensity and direction were measured and interpreted with respect to grain size, magnetic polarity and variation of the rate of accumulation. The analyses showed a general increase of accumulation rate upwards in the profile from approximately 0.03mm/y to 0.40mm/y. The sedimentation was extremely slow and possibly discontinuous in the lowermost part of the sequence, part of which is interpreted as a condensed section. The rest of the sampled profile showed more rapid and relatively continuous sedimentation during a time of normal polarity. A reverse polarity zone of 1.6m thickness was revealed in the interval 1.2-2.8m. The duration of this polarity zone is estimated to less than 70.000 years which leaves only three possibilities for correlation to the GPTS for the Tortonian stage, approximately 7.1 m.y., 7.4 m.y. or 9.9 m.y. The results indicate that the lowermost 3m were deposited during approximately 100.000 years and the 8m above this interval were deposited during approximately 20.000 years. The lowermost 8 m of the formation was not accessible in the clay pit but is known from nearby wells. This part of the sequence contains glauconite sand at the base and was thus deposited considerably slower than the studied sequence. 3) Piasecki, S.: Dinoflagellate cysts of the Middle Upper Miocene Gram Formation, Denmark. 17 textpages, 4 textfigures, 3 plates Summary: The dinoflagellate cysts of the Gram Formation provide the biostratigraphic framework for the determination of the age of the formation and reflect environmental and palaeoclimatic conditions during deposition. The age of the Gram Formation is Late Serravallian and Tortonian (late Middle Miocene to early Upper Miocene) estimated on the basis of dinoflagellate cyst biostratigra. Seller Inventory # W11619

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ROTH, F. & HOEDEMAKERS und K. [EDS.]:

Published by (2005). (2005)

Used

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From: Dr. Frank Rudolph (Rickling OT Fehrenbötel, D, Germany)

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About this Item: (2005)., 2005. 190 S., 32 Abb., 1 Tab., 16 Taf., Behandelt werden die Seeigel, Krabben und Mollusken des berühmten Fundortes Gram/DK. Sprache: Deutsch Gewicht in Gramm: 1500. Seller Inventory # 3968

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