Physics
Scientific paper
Jun 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..921b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 6, pp.921-922
Physics
3
Scientific paper
Moldavites occur in the southwestern part of Czechoslovakia in two mutually not fully connected areas--in southern Bohemia and in southwestern Moravia. Moldavite occurrences can be divided into three groups: 1. 1. High-altitude gravels and sands (old terraces) 2. 2. Slope loams 3. 3. Alluvial deposits along present-day water courses To date I have no reliable evidence of a moldavite find in undisplaced eluvium. An explicit and safe age classification can be given only for the second and third type of occurrences. The slope loams belong to the Pleistocene, the young deposits along the present-day water courses mostly to the Holocene, less often to uppermost Pleistocene. The question of the age of the so-called high-altitude gravels has remained debatable and imprecisely formulated. There exists evidence showing that the moldavite-bearing gravels are younger than the Mydlovary series in southern Bohemia of Miocene age. The present research, however, shows that the moldavite-bearing gravels are also younger than the Ledenice series of Pliocene age. The stratigraphic conditions in Moravia are by no means simpler. We lack there even the determination of the age of the terraces and their systematic study in the drainage area of the Jihlava river. The explanation that the fall of moldavites took place in the period closely preceding the sedimentation of the high-altitude gravels or simultaneously with their sedimentation seems to be the most acceptable. It is towards the end of the Pliocene or in the Pleistocene.
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