茨城県産化石植物-5-

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The present author has described in his previous paper (1959) the list of fossil plants from Oarai district, which includes 61 species belonging to 52 genera, i. e.: 1 species of Hepaticae, 5 species in 4 genera of Filicales, 4 species in 3 genera of Equisetales, 5 species in 4 genera of Cycadophyta, 4 species in 4 genera of Coniferae, 3 species in 3 genera of Monocotyledoneae, 39 species in 32 genera of Dicotyledoneae. Palaeobotanical composition of the Oarai Flora seems to be similar to the Kaltag Flora (Alaska) and the Gyliakian Flora (North Sakhalin), and the common genera in the Oarai, Kaltag, Gyliakian and Lance Flora are listed in Table 1. As the result of the consideration of the Dakota, Kaltag, Vermejo, Laramie and Lance Flora, the geological age of the Kaltag Flora is younger than the Dakota Flora and older than the Vermejo Flora, therefore the age of the Oarai flora is probably correspond to the Vermejo Flora or more older than the flora. The palaeoclimate, which was
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