280 



Fossil. I'LAN'l'S V\nm TEXAS FONTAINE. 



plants toiiiid t(» be idciitii-al willi ccitain ol' tlioscol' (lie oldest Poto- 

 mac ,sli(»\\s that tlicrc is lit Mc diriciciK-c in (1m> jij;*', ol" tlie two forma- 

 li(tns. Tlic idiiid bearing' poition ol" tlic'riiiiil y is somcwliat oldtM-tliaii 

 tlic basal Potonuic sti-ata, but tho dilllcriMirc in a^c can not be ^icat. 



There can be little doubt tliat a(lditi«Mial collections IVoni the 

 Trinity slrata will show at least some of tin' ohier forms (d" an<;io- 

 sperins Ibund in tlic i'otomac, hut at present they are uot known to 

 exist. It will be eouxenieid., for the purpose of comparison, to j;ive iii 

 the form of a table the i)lants found at (Jlen K'ose. In it the plants 

 will be placed in the Ibiniations in which they have been previ(»nsly 

 found, and where sindlar, but U(»t identical, species haxc been \)W 

 viously known they will be indicated in the jjioper formation, hi the 

 liisl column the peculiar species, or Ibose t hat occur only at <!len Hose, 

 will be plac<'d. 



Tabic of (lien Jtufic Juxsilx. 



liiir 

 spofies. 



1. K(|iiis<'tiiiii fi» 



SlilU'UoliU'I is \ :ilclriisi.s ,' 



Uiooiiilt's r.ucliijiniis \iii-. liiiiiiiTvi.s 



DiooiiitcM r.iicliiaiuis 



Diooiiilcs I'.iK liiniiim viir. ;iii;;iislil'oliii.- 



l)i<)<iiiitt's KiiiiKcriiiims 



l'<i(l()/:iinilcH ;i<iil iluliiis 



I'lxldZiiinitcM species ! 



/.nniites teiniiiiervis 



Alii, tiles LiiiUii 



I.iiiiiopsis IdUiiifdliii 



S|iiieiii>li'iiiiliiiiii Stenibergiiiiiuni, viir. 

 (lelisilMliiiiii. 



rilliis s|>e< ies ' 



Hiarhypli\ lliiiii texeiise 



I'li.uiopliN lluiii iliiliiinii 

 Krenelopsis varians. . 



Krelieloiisis Uolielie^ffevi 

 SeniKiiii i)af;ii>i)li,\ lloitles. 



Aliietiles ! spiicies 



Willianisdiiia texaiia. . .. 

 Carpolitliiis iiIk>\ aliis . . 

 C'lirptilillms Uarvevi 



lilt. (\ve:itltMis]>ei'iiiiiiu rot initial iiiii 



Oceiii-rillij 



ill till' 



I'otoliiac 



lonnatioii. 



Neai' I'll] iii.sil mil 

 virKinieiiiii. 



Near OiodiiitfH 

 I'.iicliiaMiis. 



Near I'dilci/.aniite.s 



ilislaiil iner\ is. 



Niar I'.iaeli.vpliyl- 

 liiiiK rassieaiilc. 



Near Krelielopsis 

 pareeiaiiiosa. 



Ni'ar CarpoliUiiis 

 eiir\ alim. 



<i Hiniiliir. 

 7 idelitieiil. 



Oeciirrill;; 



ill the, 

 Tr^iiuiaii 

 t'oriiiatioii. 



Near IliiMinili 

 liiuliiaiiiis 



1 .similar. 

 'J iilelilieal. 



From this table it will In- seen that all the species of the Olen Ivose 

 Ib.ssils hitherto found (x-eur in the bower Cretaceous, ranyiuii- from the 

 WCaldcn to the lIrj>'onian. 'fhe I'otomac includes both these epochs. 

 Someof the Ibssils tVom (Jlen l{os«' have no value for the lixinji' of the a^e 

 of thellora because they are not sidliciently well charaet«'ri/.ed. Of such 

 a nature are Sithi iu>i>l<ris rahleiisis'!, the undeterudned specMesofrodoza- 

 ndtes, tlu' species of IMnus, ami the undetermined cone. ()mittinf>- 

 tlu'se. w«' have niiM-teen species. l'\tur <d* these are jieiadiar species, 

 and thev of course can not be taken into consideratiou when the Triu- 



