Fossil forest reveals sunspot activity in the early Permian: COMMENT
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Comment and Reply on "Fossil vertebrate footprints in the Coconino Sandstone (Permian) of northern Arizona: Evidence for underwater origin" COMMENT
Brand and Tang (1991) proposed that certain unusual vertebrate trackways "point to subaqueous deposition for at least part of the Coconino Sandstone." They supported their conclusions by demonstrating that western newts produce similar trackway configurations in aquarium experiments. While it is encouraging to see vertebrate ichnology play such a prominent role in fundamental questions concerni...
متن کاملCombining Fossil and Sunspot Data: Committee Predictions
Eric A. Wan Department of Electrical Engineering Oregon Graduate Institute P.O. Box 91000 Portland, Oregon 97291 [email protected] Abstract It is hypothesized that 680 million years ago solar magnetic storms producing ultraviolet and X-radiation a ected the earths ozone layer, which in turn in uenced the variations in the silt deposition from glacial run-o . Preserved as fossils discovered in ...
متن کاملJuvenile-adult habitat shift in permian fossil reptiles and amphibians.
Among extant large reptiles, juveniles often occupy different habitats from those of adults or subadults and thus avoid competition with and predation from the older animals; small juveniles often choose cryptic habitats because they are vulnerable to a wide variety of predators. Evidence from fossil humeri and femora of Early Permian reptiles collected from sediments of several distinct habita...
متن کاملComment on “The sunspot as a self-excited dynamo”
A recent paper claims that the well known Cowling ‘anti-dynamo’ theorem is a “misconception”, and that a simple axisymmetric sunspot model constitutes a counter example. We do not believe these claims to have been substantiated.
متن کاملDiscriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history
The fossil record of early vertebrates has been influential in elucidating the evolutionary assembly of the gnathostome bodyplan. Understanding of the timing and tempo of vertebrate innovations remains, however, mired in a literal reading of the fossil record. Early jawless vertebrates (ostracoderms) exhibit restriction to shallow-water environments. The distribution of their stratigraphic occu...
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ژورنال
عنوان ژورنال: Geology
سال: 2017
ISSN: 0091-7613
DOI: 10.1130/g39414c.1