Ancient sea water
Article Abstract:
The analysis of fossilized sea water should be a useful method to determine the history and composition of ancient seas. However, the analysis is confounded by the effects of fresh water seepage, evaporation and the composition of the rocks or minerals in which the ancient water is embedded. Despite the controversy surrounding the chemical analysis of water inclusions, results of these analyses have been used to infer the history and composition of the hydrosphere. A recent discovery of tiny mineral cements will contribute much to this fossil record. Analysis of these cements indicate that they contain the world's oldest fossil ocean water.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Life and times of the Bering land bridge
Article Abstract:
The Bering land bridge was covered by mesic shrub graminoid tundra vegetation during the last glacial age. Analyses of 20 cores from the Bering and Chukchi Seas show the presence of ponds and coastal marshes with little water inflow. The cores contain fossils of plants and insects found in mesic tundras. No fossils of plants found in steppes or grasslands are present in the cores. Human and animal migration occurred till 11,000 years BP as the land bridge was above the sea surface. The summers were warmer and winters colder than modern times during the last stage of the glacial age.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Reinterpretation of Yunnanozoon as the earliest known hemichordate
Article Abstract:
An analysis of the notochord, musculature, pharynx, branchial arch, and gonads of the fossils of Yunnanozoon lividum obtained from Ma'anshan section, China, show that the animal is a hemichordata. Yunnanozoon superficially resembles the chordates, but the distinct tripartite body plan corresponds to the living enteropneust hemichordates. The hemichordates are an anatomical link between chordates and invertebrates.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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