USNM 37572 Paracredneria crednerioides Hollick  

Notes

Hollick (1930)

Pl. 54 Fig. 1

 

 

Locality

From Hollick (1930) (p. 90)

"Yukon River, north bank, about 3 miles above Pickart's mine (original No. 3AH18); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3253)."

 

Locality Map

 

Description

From Hollick (1930) (p. 90)

"Plate 54 Figure 1"

"Leaf apparently slightly inequilateral, roughly obovate-elliptical, with flattened sides, about 13 centimeters in length by 10 centimeters in width at the broadest part (above the middle), coarsely and irregularly triangular-dentate from just below the middle upward, entire or undulate below; nervation pinnate, craspedodrome; secondary nerves flexuous, widely spaced, irregularly disposed, forked or branched from the under sides, leaving the midrib at acute angles of divergence, curving upward, except close to the margin, where they bend slightly backward and term"inate in the dentitions."

 

Remarks

From Hollick (1930) (p. 90)

"This fragmentary leaf has the nervation of Paracredneria and the characteristic obovate outline of Credneria. The apex is apparently turned to one side, the secondary nerves appear to be unequal in number on the two sides of the midrib, and there is a difference of about 1 centimeter in width between the two sides of the leaf, measured from the midrib to each opposite part of the margin. If complete the leaf would apparently show an outline similar to Credneria zenkeri asymmetrica Richter (1905) (p. 12, pl. 5, figs. (4?), 5).

The discovery in Alaska of this and apparently of one of the new species of Paracredneria - a genus known heretofore from only one locality, in the Old World - is of considerable ecologic as wen as paleontologic interest, especially as, until the discovery of the Alaskan species, the genus was represented only by a single known species."