162 



SHORTER rONTEIBITTTONS TO GENERAL GEOLOGY, 1&21. 



distribution. It occurs in both the Atane and 

 Patoot bods of western Greenland, in the Da- 

 kota sandstone of the West, in the Magothy 

 formation of Maryhmd, and in the Bingen 

 sand of Arkansas and is very common m the 

 Tuscaloosa formation in western central Ala- 

 bama. Abroad it has been recorded from the 

 lower Tm'onian of Bohemia. Dawson recorded 

 it from Peace Kiver in Northwest Territory. 



It occurs in the Dakota sandstone in Wood- 

 bury County, Iowa, in Ellsworth Couutj', 

 Kans., and near Lander, Wyo. It is thus a 

 member of the true Dakota sandstone flora. 

 This is also emphasized by its distribution in 

 the Upper Cretaceous oi the Atlantic Coastal 

 Plain. 



Although abundant this species lacks good 

 diagnostic characters, and its botanical affinity 

 is therefore uncertain. Its relation to Alyrica 

 is extremely doubtfid. 



Order SALICALES. 



Family SALICACEAE. 



Genus SALIX Linne. 



Salix lesquereuxii Berry. 



Salix lesquerci,ijii Berry, Torrey Hot. Club Bull., vol. ,36, 

 p. 252, 1909; vol. 37. pp. 21, 194. 1910; New Jersey 

 Geol. Survey Bull. 3, p. 114, 1911; U. S. Geol. 

 Survey Prof. Paper <S4, pp. 33, 109, pi. 7. figs. 11-13, 

 1914; Maryland (!ieol. Survey, Upper Cretaceous, 

 p. 814, pi. 58. figs. 5-8, 191G; Torrey Bot. Club 

 Bull., vol. 44, p. 176, 1917; U. S. Geol. Survey 

 Prof. Paper 112, p. 76, 1919. 

 Salix proti-iiffolhi Lesquereux, Am. .Jour. Sci., 2d ser., 

 vol. 46. p. 94. 1868 (not Forbes); The Cretaceous 

 flora, p. 60, pi. 5. figs. 1—1, 1874; The CretaeeoiLs 

 and Tertiary floras, p. 42, pi. 1, figs. 14-16, pi. 16, 

 fig. 3, 1SS3; The flora of the Dakota grouii, p. 49. 

 1892. 



Newbeny, The flora of the Amboy clays, p. (id, pl.>lS. 

 figs. 3, 4, 1896. 



Kurtz, Mus. La Plata Rev., vol. 10, p. 51, 1902. 



Berry. New .lersey Geol. Siu'voy Ann. Rept. for 1905, 

 p. 139, 1906; Torrey Bot. ('luh Bull., vol. 33, p. 

 171, pi. 7, fig. 2. 1906; Johns Hopkins I'niv. ('ire., 

 new ser.. No. 7, p. 81. 1907. 

 Sdli r prulcacJoUa Uniqrfoliti Le-sfjuereux, The floia of tlie 

 Dakota group, p. .50, pi. 44, fig. 9. 1892. 



Bartsch, Iowa Vn\\. Lab. Nat. Hist. Bull., vol. 3, p. 



179, 1896. 



J'roliDidis d(t i>}nii»imi(hs Heer. Newberry. The flora of 



the Amboy clays, p. 72 (part), pi. 32, fig. 11. 1896. 



Dnrnlqiien yronilandica Heer. Newberry, The flora of 



the Aml>oy clays, p. 129 (part), pi. 41, fig. 12, 1896. 



Leaves ovate-lanceolate. s(.)mcwlial- more 

 acuminate above than below, variable in size, 



ranging from 6 to 12 centimeters in length 

 and from 1.1 to 2.2 centimeters in greatest 

 widtli, which is usually slightly below the 

 middle. Petiole stout, much longer than in 

 Salic fitxuosa, having a maximum length of 

 1.2 centimeters. Midrib stout below, tapering 

 above. Secondaries numerous, in some speci- 

 mens as many as 20 pairs; they branch from 

 the midrib at angles of about 45° and are sub- 

 parallel and camptodrome. 



This species is exceedmgly variable, as might 

 be expected in a Salix, and Lescjuereux estab- 

 lished several varieties, of which at least one, 

 rinrarifoUa, is referalde to Salix flexuosa New- 

 berry. Some of Lesquereux 's forms are dis- 

 tinguishable with difficulty fnmi Salix flexiiosa, 

 and this is especially shown in the leaves which 

 he figures on Plate I of his '"Cretaceous and 

 Tertiary floras. ' They are, however, larger 

 and somewhat more robust, of a thicker texture 

 and bn)adest near the base, from wliich they 

 taper upward to an exceedingly acuminate tip. 

 In general Salix Ifsquereuxii is a relatiA'ely 

 much broader, more ovate form, with more 

 numerous and lietter seen secondaries ami a 

 longer petiole. 



This species is an exceedmgly abmidant 

 Upper Cretaceous type in both the East and 

 the West, ranging chronol(\gically in the Coastal 

 Plam from the base of the Raritan formation 

 to the top of the Tuscaloosa formation, and 

 possiiily through the Eutaw formation as well. 

 It is aljundant hi the Magothy and Black Creek 

 formations, mclutlmg the Middendorf arkose 

 member of the Black Creek. It is \\'idespread 

 from the bottom to the top of the Tuscaloosa 

 formation in Alabama and occurs in the Bingen 

 sand of Arkansas. In the West it is a member 

 of the Daicot a sandstone flora and is not present 

 hi the older Cheyenne sandstone flora, nor is it 

 laiown from beds younger tlian the Dakota 

 sandstone bi that region. It is one of the forms 

 recorded l)y Kurtz from the Upper Cretaceous 

 of Argentuia, indicating, if the identification 

 is correct, which is iloubtful, a very consider- 

 able migration tlurmg early Upper Cretaceous 

 time. 



Recently luiowlton"* has tentatively identi- 

 fied this species from the type section of the 

 Morrison formation ui Colorado. 



'« Knowlton, F. H., Am. Jour. Sci., 4th ser., vol. 4U, p. 190. 1920. 



