SHORTEB CONTRIBUTIONS TO GENERAL GEOLOGY, 1922. 



Gleditsiophyllum :enicum Berry. 



Mespilodaphne coushatta Berry. 

 Myrcia vera Berry. 



Persea longipetiolatum (Hollick) Berry. 

 Sabalites grayanus Lesquereux. 



The type exposure of the Carrizo sandstone 

 is in the quarries about half a mile west of 

 Carrizo Springs, in Dimmit County. This, as 

 well as the numerous other exposures of 

 Carrizo and other Wilcox deposits in south- 

 western Texas, will be described in detail in 

 A. C. Trowbridge's report on this region. 



From the Carrizo sandstone at the type local- 

 ity the following species were collected: 



Acrostichum sp. 

 Anona ampla Berry. 

 Anona wilcoxiana Berry. 

 Oanavalia eocenica Berry? 

 Cassia tennesseensis Berry. 

 Cinnamornum vera Berry? 

 Dryophyllum tennesseensis Berry? 

 Reus mississippiensis (Lesquereux) Berry. 

 Nectandra pseudocoriacea Berry. 

 Oreodaphne obtusifolia Berry. 

 Oreodaphne puryearensis Berry. 

 Palmocarpon butlerensis Berry. 

 Pterobalanus texanus Berry. 

 Sabalites grayanus Lesquereux. 

 Sophora wilcoxiana Berry. 

 Sterculia wilcoxensis Berry. 



The foregoing list represents a typical upper 

 Wilcox flora. Fragments of leaves are not at 

 all uncommon in the hard sandstones of the 

 Carrizo and were observed at a considerable 

 number of additional outcrops, but the hard- 

 ness of the material rendered collecting diffi- 

 cult, and the coarseness of the matrix, which 

 obliterated the venation, made the determina- 

 tions inconclusive. Nowhere, however, did 

 these fragments suggest Claiborne forms, but 

 all were believed to represent well-known up- 

 per Wilcox species. 



Near the Rio Grande the Carrizo sandstone 

 becomes thin and is overlain by beds showing 

 more typical Wilcox lithology. A section on 

 Concillas Creek a quarter of a mile above its 

 mouth, in Webb County, exposes the following 

 materials : 



Sandstone. 



Brownish laminated clay with leaves. 



Local unconformity. 



Ripple-marked sandstone. 



Clay parting. 



Sandstone with sticks and leaf fragments. 



Gray clay. 



From the brownish clay above the local un- 

 conformity, not far below the Wilcox-Mount 

 Selman contact, the following plants were 

 collected : 



Anaeardites grevilleafolia Berry. 

 Banksia puryearensis Berry. 

 Cassia marshallensis Berry. 

 Cyperites sp. Hollick. 

 Inga wickliffensis Berry? 

 Juglans schimperi Lesquereux. 

 Mimosites variabilis Berry. 

 Mimusops mississippiensis Berry. 

 M vrica wilcoxensis Berry. 

 Sabalites grayanus Lesquereux. 

 Sophora wilcoxiana Berry. 



From the sandstone two excellent speci- 

 mens of Carina eocenica Berry were collected. 

 The whole section is clearly upper Wilcox in 

 age. 



From Elm Creek on the Schuddemagen 

 ranch, in eastern Uvalde County, considerably 

 above the Cretaceous-Midway contact de- 

 scribed by Stephenson, 2 a single specimen of 

 Rhamnus cwAshatta Berry was collected. This 

 is a typical upper Wilcox form and suggests 

 that the Midway is unusually thin in this sec- 

 tion, which is in conformity with its entire ab- 

 sence on the Nueces. 



A systematic account of the new or note- 

 worthy species of plants that have been added 

 to the flora of the Wilcox group and are dis- 

 cussed in the present contribution is given 

 below. 



Phylum BRYOPHYTA. 



Class HEPATICAE. 



Order MARCHANTIALES. 



Genus MARCHANTITES Brongniart. 



Marchantites stephensoni Berry, n. sp. 



Plate IV, figure 1. 



Plant body thallose, consisting of a linear, 

 repeatedly dichotomously forked thallus thick- 

 ened medianly and with somewhat irregularly 

 placed oblique and transverse markings, be- 

 lieved to represent appressed rhizoids. 



The material is scanty and of slight botanic 

 importance. Except that the margins are 

 straighter the present form is indistinguishable 

 from Marchiiulia xezannensis Brongniart, 3 from 



2 Stephenson, L. W., U. S. Qeol. Survey Prof. Paper 90, p. 177, 1915. 

 ( Saporta, G. de, Prodrome d'une flore fossile des travertins anciens 

 de Sezanne, p. 30S, pi. 1, figs. 1-8, 1868. 



