3fesozoic and Coenozoic Geology and Palaeontology. 31 



from the valley of Mackenzie's 'R'wer, AmmonUes, barnstoni; and A. 

 hilUngsi. 



Prof. Leo. Lesqnereux* described, fi'om Vancouver's Island, and Bell- 

 ingham Bay, Populas rhomhoidea.^ Sallx islandlcus, Quercus benzoin, 

 Q. muUincrvis^ Q. evansi, Q. gaudini, Q. platinervis, Planera dabia-, 

 Cinnamomiini heeri, now Daphnogene heeri^ Persoonia oviformis, and 

 Diospyvos lanclfolia. 



In ISfiO, Dr. B. F. Shumarclf subdivided the Cretaceous strata of 

 Texas in descending order, as follows: 1. Caprina limestone, having a 

 thickness of GO feet, and consisting of a yellowish white limestone 

 usually' massive, sometimes of a finely granular structure, and some- 

 times made up of rather coarse, subcrystalline grains, cemented with a 

 chalky paste. It has an extended geographical range. 2d. The Co- 

 manche Peak Group, having a thickness of 300 to 400 feet, and made 

 up of soft, yellowish and whitish chalk^'- limestone, and buff and cream- 

 colored limestones of greater or less compactness, being highly fossilif- 

 erous, and having a great geographical extension. 3. The Austin 

 limestone and fish bed, having a thickness fiom 100 to 120 feet. The 

 Austin limestone consists of cream-colored and bluish earthy limestones, 

 and the fish beds of shaly laj^ers of dark-bluish-gray calcareous sand- 

 stone. This is supposed to represent Nos. 4 and 5 of the Nebraska 

 section, by Meek & Hayden. 4. Exogyra arietina marl, having a thick- 

 ness of 60 feet, and consisting of an indurated blue and yellow marl 

 with occasional bands of gray limestone, and thin seams of selenite in- 

 terstratified. 5. Washita limestone, having a thickness from 100 to 

 120 teet, a wide geographical range, and consisting of white, j^ellow, 

 gray and blue limestones, some of which are moderatelj^ hard, and 

 others disintegrate rapidl}^ This is supposed to be parallel with the 

 lower part of No. 3 of the Nebraska section, by Meek and Hayden. 

 6. Blue marl, having a thickness of 50 feet, and consisting of an in- 

 durated arenaceous marl, of a schistose structure, with small nodules 

 of iron pyrites and irregular masses of lignite disseminated through 

 it. It is not observed south of Grayson county, and is supposed to 

 correspond with No 2 of the Nebraska section. 7. Caprotina lime- 

 stone, having a thickness of 55 feet, and forming the basis of what is 

 called the Upper Cretaceous Group. It is composed of light gra}^ and 

 3'ellowish gray earthy limestone, with intercalated bands of yellow 

 marl and sometimes flint, and is exposed at the base of the hills near 

 Comanche Peak, and underlying the Washita limestone near the Colo- 



* Amer. Jour. Sei. and Arts, 2d Series, vol 27. 

 t Trans. St. Louis Acad. Sci., vol. 1. 



