206 
and Widdringtonites. The vast majority of 
these are old genera which became extinct 
before the dawn of the Upper Cretaceous and 
which give the Albian facies to the Patapsco. 
Even as regards the angiosperm element of the 
Patapsco, which might be expected to show 
more similarities to only slightly younger 
formations, the following genera of the Pa- 
tapsco are not represented in the Cheyenne: 
Cyperacites, Plantaginopsis, Alesinaphyllum, 
Populus, Populophyllum, Nelumbites, Meni- 
spermites, Celastrophyllum, Cissites, Araliae- 
phyllum, Hederaephyllum, and <Aristolochiae- 
phyllum. 
The angiosperms of. the Cheyenne flora, 
comprising ‘only eleven species of six genera, 
contain but two genera that are found i in the 
Albian (Sapindopsis and Sassafras). 
Moreover, the Cheyenne flora entirely lacks 
those supposed Dakota sandstone species 
which are common in the Woodbine sand of 
Texas, the Bingen sand of Arkansas, the Tusca- 
loosa formation of Alabama, and the Raritan, 
-Magothy, and allied formations of the Atlantic 
coast region and which clearly show that the 
so-called Dakota flora as it stands in the litera- 
ture is not a- Crono lpete unit and that there 
bine flora,’* 
SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1921. 
is a Dakota sandstone which is approximately 
of the same age as these formations and which 
I am inclined to consider of Turonian age 
according to European standards. 
I regard the Cheyenne flora as clearly of the 
same general facies as those of the Upper Cre- 
taceous formations that immediately succeeded 
the Cheyenne sandstone in time and as set 
apart from any known Lower Cretaceous floras 
by the. absence of the characteristic Lower 
Cretaceous element in part exemplified by the 
Patapsco genera of ferns, cycads, and conifers 
enumerated in a preceding paragraph. 
The Cheyenne flora is unquestionably older 
than'the flora of the Woodbine sand of Texas, 
for although the latter also consists largely of 
so-called Dakota forms there is not a single 
species that is common to the Cheyenne and 
Woodbine, and the “Dakota” species of the' 
Woodbine are nearly all the common forms of . 
Coastal Plain formations of known age. I 
have recently completed a study of the Wood- 
so that these. statements are 
authoritative. 
The range of the plants found in the Chey- 
enne sandstone is given in the appended table 
of distribution. 
‘Distribution of flora of Cheyenne sandstone. 
| Dakota sandstone. 
| Tuscaloosa formation. 
| Raritan formation. 
Cladophlehis dakotensis. ( Lesquereux) 
BeMryenasoctscaes s seesggacheins -eee seats 
Asplenium dickeonianam Heer 
Gleichenia nordenskiéldi Heer % 
Gleichenia? bohemica (Corda) Berry...... Soudan lioteiers 
Cycadeoidea munita Cragin 
Cycadeosperinum lineatum Lesquereux. . . 
Sequoia condita Lesquereux 
xxx: 
| Magothy formation. 
| Black Creek formation. 
Kootenai formation. 
| Uppet Cretaceous, Sak- 
alin Island. 
| Patuxent formation. 
Patapsco formation. 
Fuson formation. = 
Lakota formation. 
Patoot beds. 
Cenomanian. 
| Emscherian. 
Atane beds. — 
| Kome beds. 
Dag! 
Cupressinoxylon che ennense Penhallow..|.... ees site Seopa eae a ws see as uals ae Bee ieee st are 
Abietites ernestinae Lesquereux 
Abietites longifolius (Fontaine) Berry. 
Arundo groenlandica Heer?.............. aA Re i el - 
Sapindopsis variabilis Fontaine. . 
Sapindopsis magnifolia Fontaine. . 
Sapindopsis brevifolia Fontaine 
Sapindopsis belviderensis Berry 
Sterculia towneri (Lesquereux) Berry... 
Sterculia mucronata Lesquereux 
Sassafras mudgii Lesquereux 
Aralia ravniana Heer.,.....-........----- is 
Aralia polymorpha Newberry 
Araliopsoides cretacea (N is Ga Berry. . 
oi Seer ee 
>xxxX! x! 
Carpolithus belviderensis Berry.......-..:|---.|2-.-[-0-eferee|-2eefeeee[oee-[eeee|oee-[oceclecechce decd cecloe loo 
Feistmantelia oblonga Ward 
10 Berry, E. W., The flora of the Woodbine sand at Arthurs Bluff, Tex.: U. 8. Geol. Survey Prof. Paper 129, pp. 153-181, 1922. 
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