USNM 37311 Fucus irregularis Hollick  


Hollick (1930)

Pl. 1 Fig. 1



From Hollick (1930) (p. 37)

"Yukon River, north bank, just below Pickart's mine (original No. 3AH18b); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3255)."


Locality Map



From Hollick (1930) (p. 37)

"Plate 1, Figure 1"

"Frond irregularly dichotomously branched; branches approximately 5 millimeters in width; subdivisions relatively long, the lower ones distinctly separated, the upper ones shorter and closer together and ultimately overlapping."



From Hollick (1930) (p. 37)

"This specimen is very much broken and in part dismembered, so that the size and shape of the complete frond can not be determined. There can be but little doubt, however, that it is a thallophyte, and apparently it was of considerable consistency, inasmuch as more or less carbonaceous matter is preserved in connection with it. Surface markings of any kind are lacking.

The generic name Fucus is adopted for the reason that similar remains from Upper Cretaceous and lower Tertiary beds in the western United States have been descrbed and figured under the name Fucus lignitum Lesquereux (1878) (p. 42, pl. 61, figs. 24, 24a) (Ward, 1886) (p. 549, pl. 31, figs. 1, 2) (Knowlton, 1900) (p. 17, pl. 3, fig. 4) and our specimen appears to represent merely a larger species, of coarser or more vigorous habit. It also resembles remains described under the names Chondrites bulbosis Lesquereux (1873; 1878) (p. 373; p. 42, pl. 1, fig. 14) from the Vermejo formation of northeastern New Mexico, and Chrondrites filiciformis Lesquereux (1888 [1889]) (p. 32, pl. 16, fig. 1)
from the Jurassic of Cape Lisburne, Alaska."