69 
Coniferophyta 
Geiniizia formosa Heer 
Geinitzia formosa Heer, Neue Denks. Schweiz. Gesell., Bd. 24, p. 6, PL 1, 
fig. 9; PL 2 (1871). 
Knowlton, U.S. Geol. Surv., Bull. No. 163, p. 28, Pl. 5, figs. 1, 2 
(1900); Idem,, Prof. Paper 98, p. 333, Pl. 85, fig. 3 (1916); Idem., 
101, p. 251, PL 31, figs. 1-3 (1918). 
In the absence of cones it is not possible to differentiate this species 
with absolute certainty from the widespread and polymorphous species 
Sequoia reiehenbachi (Geinitz) Heer, which has been referred to the genus 
Geinitzia by Hollick and Jeffrey, on not very satisfactory evidence. 
In general the former has more slender and more incurved leaves which 
are interspersed with scale leaves. The well known variability and con- 
vergence in coniferous foliage renders the problem of determining sterile 
shoots well nigh impossible and many students of fossil plants advocate 
the use of some such noncommittal form genus as Elatocladus for such 
remains. In the present case where the interest is mainly stratigraphic 
rather than botanical, I have not considered it proper to make such changes 
in names, which are on the whole, reactionary and obseurantic, rather than 
progressive. 
What agrees precisely with Geiniizia formosa is represented by 5 
specimens of sterile twigs in the Allison formation. The species, probably 
sometimes confused with Sequoia reiehenbachi , as suggested above, is widely 
distributed in the Upper Cretaceous of both America and Europe and 
probably in Greenland as well. 
In the United States it is recorded from the Raritan, Tuscaloosa, and 
Magothy formations of the Atlantic Coastal Plain. In the Western Interior 
it is recorded from the Montana group in Montana, from the Mesaverde 
formation of Colorado and Wyoming, from the Fruitland formation of 
New Mexico, and from the Vermejo formation of Colorado. 
Brackyphyllum macrocarpum Newberry 
. Brackyphyllum macrocarpum Newberry, U.S. Geol. Surv,, Mon. vol. 26, p. 
51, PL 7, figs. 1-7 (1896) 1 . 
A single specimen from loc. 7758 shows about 7 cms. of a branch 
with, the opposite club-shaped twigs of this species. The specimen has been 
compressed and most of the details obliterated, but there can be no doubt 
but that it represents this species. The species ranges from near the base 
to near the top of the Upper Cretaceous and has been recorded from a 
large number of localities in North America. It is especially common in 
the Atlantic Coastal Plain in the Raritan, Tuscaloosa, Magothy, Black 
Creek, and Eutaw formations. In the Western Interior it has been recorded 
from the Dakota sandstone and from the Mesaverde formation of Wyoming 
and the Vermejo formation of Colorado and New Mexico. 
1 A full synonymy of this species will be found in Berry, E. W.: U.S. Geol. Surv., Prof. Paper 112, p. 59 (1919). 
