Locality

From Hollick (1930) (p. 47, 48)

"Yukon River, north bank, about 17 miles below Nulato (original No. 33); collected by W. W. Atwood and H. M. Eakin in 1907 (lot 4639) (pl. 11, fig. 1). Yukon River) north bank, shore from 2 to 10 miles below Blatchford's mine (original No. 3AH20); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3259)."

 

Locality Map

 

Description

From Hollick (1930) (p. 47, 48)

"Plate 11, figure 1"

"Ginkgo concinna Heer, Beitrage zur Jura-Flora Ostsibiriens und des Amurlandes; I, Pflanzen aus dem Gouvernement Irkutsk: Flora fossilis arctica, vol. 4, No.2, p. 63, pl. 7, fig. 8; pl. 13, figs. 6b, 6c, 7, 8, 8b, 1876." (Heer 1876)

 

Remarks

From Hollick (1930) (p. 47, 48)

"Although this species was originally described by Heer from the Jurassic of Siberia and has not been heretofore recorded from any other region or any other geologic horizon, there is no discernible specific difference between it and our specimens from Alaska, where it is an element of a flora that is undoubtedly Cretaceous. The only difference that can be noted is that our specimens are somewhat larger.

This represents one of the many similar surprises that we have encountered in comparing the Cretaceous flora of Alaska with the Jurassic flora of other regions. It apparently represents one of the many Jurassic specific types that have persisted well into the Cretaceous period; and incidentally, in this connection, it is interesting to note that Kryshtofovich (1918) (p. 40) has apparently found similar types in the Cretaceous flora
of the island of Sakhalin, where he mentions the occurrence of "Ginkgoales * * * like Baiera and Ginkgodium."