Passive margin uplift around the North Atlantic region and its role in Nothern Hemisphere late Cenozoic glaciation: comment and reply

Article Abstract:

Nicholas Eyles proposed that widespread uplift of the North Atlantic margins of North America, Greenland and Fennoscandia was coeval, coincided with continental breakup and initiated glaciation. This is questionable because there exists a time-lag of 20-25 m.y. between continental breakup and the start of uplift, and a time-lag of 25-30 m.y. between uplift and the start of glaciation. Eyles also suggested that uplift occurred by underplating of upper plate margins. However, there is no indication of magmatic underplating under the uplifted areas in western Fennoscandia.

Continental margins, North Atlantic region

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Megaflood erosion and meltwater plumbing changes during last North American deglaciation recorded in Gulf of Mexico sediments: comment and reply

Article Abstract:

P.A. Brown et al. have investigated the variations in the characteristics of Gulf of Mexico cores to elucidate the consequences of glaciation and release of glacial meltwaters into the Mississippi River. However, their chronology of events in their Great Lakes history is erroneous and that of Shackleton (1975) is more accurate. They stated a maximum glaciation of between ca. 19 and 16 ka but this was at close to or at its maximum from 20 to 18 ka. By 16 ka, the Great Lakes ice margin has already substantially subsided from its maximum.

Mississippi River, Great Lakes (North America), Gulf of Mexico, Sediments (Geology)

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Diachrony of mammalian appearance events: implications for biochronology: comments and reply

Article Abstract:

John Alroy's conclusions based on his observations of substantial diachrony in mammalian appearance events of the Cenozoic period in North America are not altogether valid because of some defects in his sampling methodology. The methodology produces skewed results because of the choice of nonrepresentative samples. By correcting these sampling errors, Alroy's suggestion that the fossil mammal taxa being studied is useless for biochronology loses weight. Alroy, on the other hand, defends his method.

Mammals, Fossil, Fossil mammals

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