164 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOflY. li>21. 



the genus F(ci/.«, where llu-v properly Ix'long, 

 they find their iiinnity in the group which 

 incUiiles, among others, such fossil species 

 as Fictts elongata Hosius, Ficus berthoudi Les- 

 (piereux, Ficus suspecla Velenovsky, and Ficus 

 kransiana Heer. 



This species has been found to be variahle in 

 size, nuiging in length from 1 1 to 22 centimeters 

 and In width from 1.9 to 3.7 centimeters. It is 

 usually widest in the lower half of the leaf, 

 although In some specimens the base is narrow 

 and the wiilest part is toward the middle. In 

 all unequivocal material the upper half of the 

 leaf is narrow and is produced as a long, slender, 

 commonly recurved tip, which is one of the 

 characteristic features of the species. This tip 

 is strictly comparable with the "dripping 

 points" developed on various modern leaves 

 in the regions where precipitation is heavy. 



Ficus (laphnoijfnoidff! is a widespread and 

 common form, ranging from Marthas \'ineyard 

 to Alabama, Arkansas, and Texas in the 

 Atlantic Coastal Plain and from the Northwest 

 Territory to Kansas and Nebraska in the 

 Western Interior region. 



It is a member of the Dakota sandstone 

 flora and does not occur in the older Che^ejuie 

 sandstone so far as my observations go. It was 

 reported by Ward from the Cheyemie sand- 

 stone at Chatman Creek, Kans., but Ward's 

 material, which I have before me, is not this spe- 

 cies but a leaflet of Sapindopsis. Kiiowlton'" 

 has recently tentatively identified this form 

 from the type section of the Morristm formation 

 at Morrison, Colo. The species is not uncom- 

 mon in the Woodbine sand at Arthurs Bluff, 

 Tex. 



Ficus glascoeana Lesquereux. 



Ficua glascoeana Lc-sqiicri'ux, U. S. (icol. Survey Terr. 

 Rept., vol. 8 (CretaceoUH and Tertiary (lorawi, p. 4S, 

 1883; U.S. Geol. Survey Mun. 17, p. 7(1, \>\. 13, figs. 

 1,2, 1891 [1892]. 

 Knowlton, U. S.Geol. Survey Twenty-first Ann. Rept., 

 pt. 7, p. 317, \'.m. 



IjCaves large, ohlong-ovalc iji general outlijU", 

 with an obtusely pointed apex and a broadly 

 rounded or cuneate, ultimately slightly de- 

 current base. Leugth from IS to 20 cenli- 

 meters; maximum width, at or below the 

 middle, 6. .5 to 7.5 centimeters. Margins entire. 

 Texture coriaceous. Surface polished. Peti- 



» Knowllon, F. H., Am. Jour. Bel., 4tb Mr., vol. «, p. ign, igjo. 



ole missing. Midril) very stout and ])romi- 

 nent on the under surface of the leaf. Secon- 

 daries numerous, thin, diverging from the 

 midrib at wide tuigles, suijparallel, straight, 

 ascending, joijiijig one another by abru|)t 

 curves subparallel with anil close to the nuir- 

 gms. 



This species, which is of the same generiJ 

 type as Ficux ntdviiia Ileer,-" was described by 

 Lesquereux from material collected 2 J miles 

 soutli of filascoe, Kans. .So far as known it is 

 cojilined to the Dakota sandstone juid to the 

 Woodbine sand at Arthurs Bhifl', Tex., and the 

 remains were usually much broken before 

 fossilization. Ficun atavina, which is closely 

 related to it, was also a stiff form, usually 

 found in a broken condition. It has an ex- 

 tensive range, occurrijig in the Atane antl 

 Patoot beds of Greenlimd, the Magothy for- 

 mati(m and the Middeiidorf arkose member of 

 the Black Creek formation in the Atlantic 

 Coastal Plam, the Turoniim of Bohemia, antl 

 the Gosau betls of Tyrol. It seems very prob- 

 able that Ficu.f (jlascoeana is genetically re- 

 lated to the more widely distributed Ficus 

 atavina. 



Order PLATANALES. 



FamUy PLATANACEAE. 



Genus PLATANTIS LinnS. 



Platanus latior (Lpsqucreuxi Knowllon. 



I'lalanus arcroidi^'! Goeppert var. lalior Losqucroux. .\m. 

 ,Tour. Sci., 2(1 ser., vol. 4G, p. 97, 1808. 



Platanus lalior (l.«8quereux) Knowlton, V. S. Gool. Sur- 

 vey Bull. 152, p. 170. 1S98: U. S. Geol. Survey 

 Twenty-first Ann. Rept.. pt. 7, p. 314. 1901. 

 norry, V. S. Geol. Survey Prof. Taper 112. p. 84. I!t20. 



Platanus pnmacva Lescpiereux. The Cretaceous llora. ]). 09, 

 pi. 7, fig. 2;pl.2fi. (ig. 2, 1H74; The lloraoftlie DakoU 

 group, p. 72, pi. 8, figs. 7, Sir. pi. 10. fig. 1, 1892. 



Tvcaves large, palmately trilobate, broadly 

 riiomboidal. Lenglli about 17 centimeters; 

 maxiinniii wicjili iiliDiil 1 ."i I'ciil iinclcrs. Mar- 

 gins somewhat iiTcguliiily dentate, entire at the 

 biDadly cuneate itasc. Lateral lobes short; 

 intervening sinuses scarcely differentiated. 

 Petiole long mill stout. Priiiuiries stout, three 

 in luimher, diverging at it ih'mi- liie l)ase in the 

 material from Alabamn Iml idiiinuuily suprii- 

 basilar in the forms from the |)aUota sandstone. 

 \'enalioii strictly platanoid. Textine coria- 

 ceous. 



• npcr, 0»wftlil, Flnrii fiwllls nrrlli-n, vol. fl, Abt. 2, p. 09. pi. II, fln. 

 Sb.Tb.Hb: pi. 17.nf.sb; i.l.lli.tlir.lh; |.|.a).ng<.1.2,l»a. 



