長野県小県郡丸子町産Stegodon auroraeの下顎臼歯に付着する粘土よりえられた珪藻化石について
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概要
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Fossil diatoms in the silts attached to the lower molar teeth of Stegodon aurorae found from Marukomachi, Nagano Prefecture, were studied. Among 20 genera 41 forms which were found in the present material, Melosira granulata and Cocconeis placentula var. lineata, were counted as dominant and subdominant respectively, being ocupied 21% and 10% of the total value numbers counted. On the basis of the autoecology of the identified species especialy of that of dominant and subdominant ones which were designated as oligohalobus, indifferent, alkaliphilous and limnophilous, the paleontological environment where the teeth of Stegodon aurorae was deposited, was presumed to be alkaline, fresh water lake or pond.
- 地学団体研究会の論文
- 1978-07-25
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- 長野県小県郡丸子町産Stegodon auroraeの下顎臼歯に付着する粘土よりえられた珪藻化石について