150 The American Geologist. September, 18W 
An extended notice of Ehrenberg's memoir by professor 
Bailey was published in 1844.* Copious extracts from the 
memoir are incorporated in the notice, and in a foot-note 
there is a figure of what is supposed to be Textularia arAeri 
cana. A year later there is another paper by professor Bai- 
ley, which appears in the 48th volume of the same Journal, 
and in the course of which the author says, concerning Fo- 
raminifera in specimens from the Missouri river, that "they 
are remarkably abundant and beautifully preserved."! 
Between 1858 and 1861 Meek and Hayden worked out the 
succession of Cretaceous strata along the Missouri. Numerous 
papers were published under the joint authorship of the geol- 
ogists named. The chalk of the Niobrara is frequently 
mentioned, sometimes as "chalk marl, "and sometimes as "cal- 
careous marl weathering to a yellowish or whitish appearance 
above;" and in their detailed section, published in the Pro- 
ceedings of the Academy of Natural Sciences, Philadelphia, 
December, 1861, the "calcareous marl" of Formation number 
3 is said to contain "several species of Textularki." 
The beds to which professor Dana refers in his Manual as 
the only known example of American chalk are doubtless the 
ones described by Mr. D. ('. Collier in 1866. \ Of the material 
forming these beds, which extend for a distance of over one 
hundred and fifty miles east and west, Mr. Collier says: "On 
one occasion, in company with a companion, I was able to 
climb to the top of a bluff of pure chalk, so soft that I could 
cut and carve it with the knife I carried in my belt, and so 
fine that it covered my clothes as thoroughly as when in my 
college days a classmate wiped the blackboard with my back." 
In his first Annual Report of the United States Geological 
Survey of the Territories, Dr. Hayden takes occasion to say 
concerning the Niobrara division of the Cretaceous : "Its prin- 
cipal character is a gray or light yellow chalky limestone; 
much of it so pure as to make a good chalk for commercial 
purposes. ""£ 
•■Am. Jour. Sci. and Arts, firs! scries. Vol. xi.vi. \>. 297, 1844. 
(Ibid.. Vol. xi.vm. p. 341, 1845. 
[Am. .lour. Sci.. second series. Vol. XLI, May, 1866. 
gFirsI Ann. Rep. of the I'. 8. Geol. Survey of the Territories, embrac- 
ing Nebraska, by F. V. Hayden. U. S. Geologist, p. 54, 1867. 
