214 



SHORTER CONTRIBUTIOIfS TO GENERAL GEOLOGY, 1921. 



meters long and 1.5 centimeters wide. The 

 average dimensions of a large number of speci- 

 mens, however, are 6 to 7 centimeters long by 

 1 to 1.3 centimeters wide. 



Leaves thick, with smooth surface. Rachis 

 and midrib stout. \'enation more prominent 

 than in the other species but still very faint, 

 with the exception of the secondaries, which 

 though fine are more conspicuous than in the 

 otlier species. Secon(hn-ies foi-ming a wide 

 angle with the midrib, nearly straight for two- 

 thirds of the distance to the nuirgin, where they 

 bend sharply upward ami join the secondary 

 next above by a sliglitly curved arch. As the 

 secondaries are numerous aud almost uniformly 

 spaced the venation resembles that of a 

 Eiicali/ptiis except that the marginal hem is 

 much ])roader than in that genus. In fact 

 some of the detached leaflets were determined 

 by Ward as forms of Eurali/p/us, as also was 

 some of the Mrginia matecial of this species. 



This species is exceeihngly abundant at many 

 localities in the Pata|)sco fornuition in Maryland 

 and \'irginia and is by far tiie most characteristic 

 species of that formation, although it has not 

 been detected at certain other undoulited 

 Patapsco horizons. Not esp<u-ially ciiaj-a.cteris- 

 tic material is abundant along Oak Creek, 

 Wyo., in lieds that liave been ix'ferred to the 

 Fuson formation. This s|)('cies was also sug- 

 gested by Cockerell -' for some leaves from an 

 utdvnovAHi geologic horizon in southwestern 

 Colorado. I have since examined tliis material, 

 wliicii is very inconclusive, in my opinion. 

 Cockerell infers that Supi/idopNi.'; may be re- 

 lated to Gnctinii. but I camiot see any warrant 

 for such a supposition. 



This species is an exceedingly varial)le form 

 in all its details, and as duiing maceration the 

 most variable apical portion is the last to be 

 destroyed, this variability is emphasized in 

 fragmentary material such as that usually 

 found. When well preserved it furnish(>s most 

 striking specimens, as may be seen fi'om the 

 specimens reproduced |)lK)t(igra[)hically in 

 Plate LV digs. 2-4). In life its rigid pinnate 

 leaves and strict appearance nuist have made 

 it a very striking nu'udx'r of the Cheyenne 

 flora. 



The Cheyenne sandstone occurrences of 

 Sapindopsis variabilis are Osage Hock at Bel- 



" Cockeri'll. T. D. A.. Washington .ioarl. Sci. Jnur., vol. e.p. no, 191B. 



videre (2217, 2232) ; Stokes Hill (2220) : Thomp- 

 son Creek near the flume, 2 miles northwest of 

 Bel videre (2221); Champion (Wildcat) Draw, 

 three-fourths mile south of Belvidere (2222); 

 Champion (Wildcat) Draw, right (east) branch, 

 in "Lanphier shale," hair a mile south of 

 Belvidere (2224, 2228, 2231) ; in shale m a draw 

 1 mile southwest of Belvidere (2225) : left bank 

 of middle branch of Champion (Wildcat) Draw 

 (2229) ; shales in draws north of Belvidere 

 (2230) ; iirst draw west of Champion (Wildcat) 

 Draw (2233). 



Sapindopsis magnifolia Fontaine. 



Plat.' LV, (if;iire h; Plate LVI, Plate LVII, (igure 2; Plate 

 LIX, figure 'A. 



Sapindopsis iiiwinifolid Fontaine. U. 8. Geol. Survey 



Mon. 16, p. 207, pi. 1.51, figs. 2, 3: pi. 152, figs. 2, 3; 



pi. 153, fig. 2; pi. 154, figs. 1, 5; pi. 155. fig. fi, lSi)0; 



in Ward, U. S. Geol. Survey Mon. IS, pp. 481, 482, 



528, 1!)06. 

 Berry, U. S. Nat. Mus. Proc, vol. 38, p. 042, 1010; 



Maryland Geol. Survey, Lower Cretaceous, p. 471, 



pi. 86; pi. 87, fig. 1; pi. 88, 1911. 

 Araha diihia Fontaine, U. S. Geol. Siu'vey Mon. 15, p. 



314. pi. 157, fig,s. 1, 7, 1890. 

 S(ipinili>psis obtnsidolia Fontaine, idem, p. 301, pi. 156, 



fig. 13; pi. 1.59, figs. 3-G. 

 Ficophyllum ciicali/ploides Fontaine, idem. p. 294, pi. 164, 



figs. 1. 2; in Ward, U. S. Geol. Survey Mon. 48, p. 



489, 1906. 

 Snpinildpds tniiiimrvis Fontaine, U. S. Geol. Siu^vey 



Mon. 15, p. 301. pi. 153, fig. 1, 1890; in Ward, 



U. S. Geol. Survey Mon. 48, pp. 489, 528. 1906. 

 Rhus nddcni Lesqucreu.x. 1'. S. Geol. Siu'vey Mon. 17 



(Flora of thi' Dakota grou]il. p. 151. jil. 57, fig. 2, 



1892. 

 Knowlton. ill Hill. .\iii. .Iinir. Sci.. 3d scr.. ^■ol. 50, 



p. 213, 1805. 



Leaves commouly odd-|)inuiite, tdlhough a 

 few even-{)innate forms occur, of considerable 

 size but somewhat variable. Leaflets three 

 pairs, comparatively large, lanceolate, tapering 

 almost equally toward apex and base, the base 

 inetpiilateral excejit in terminal leaflets, pointed, 

 often lacking apical portions, length increasing 

 proximad, averaging about 10 centimeters, 

 longest seen 14 centimeters (estimated), short- 

 est 5 centimeters, width varying from 1.1 to 3.2 

 centimetei's, inctjuilateral, as the outer half of 

 the lamina is broader than the inner half atid is 

 markedly deciuicnt. This feature is least em- 

 phasized in the basal leaves, which may even 

 have a consitlerable petiole, but becomes in- 

 creasingly pronounced distad, the terminal 

 leaflets often forming a bilobate or trilobate 



