488 Bibliographical Notice. 
To the Lower Tertiary belong the :— 
Bear-River group, with coal-beds 26 feet thick at Evanston (p.91); 
Placer-Mountain group, with coal, thirty miles south of Santa Fé, 
New Mexico ; Raton-Hills group, with coal; Cafion-City group, with 
coal ; Judith-River group ; and, lastly, the Fort-Union or Great Lig- 
nite group,of which probably the Placer-Mountain, Raton-Hills, and 
Cajion-City groups are fragments ; whilst those of Bear River, Judith 
River, and perhaps other places, were independent lacustrine forma- 
ions*, 
In the * Annals,’ ser. 3. vol. xi. (1862), we have already given an 
abstract view of the geology and natural history of the Upper Mis- 
souri (a continuation northwards of the geology of New Mexico and 
Colorado), founded on Dr. Hayden’s researches (with Dr. Meek and 
others) in 1857—60, published in his Report of 1862; and we have 
now before us a fuller account (published in 1869) of some of the 
researches there referred to, namely those carried out in company 
with Capt. (now Lt.-Col.) Raynolds, in 1859-60, on the Yellowstone 
and Missouri Rivers, and by the author on the Niobara and White 
Rivers, and some remarks on the Dakota Territory. A special fea- 
ture in this report (pages v-ix) is the careful historical account of 
earlier labours in this grand geological field of North-western Ame- 
rica, extending from 42° to 49° North lat., and between 98° and 
whether Triassic or Lower Cretaceous Dr. Hayden does not feel 
competent to declare. 
In Dr. Newberry’s Report on the Cretaceous and Tertiary Plants, 
we have an eloquent exordium on the growth and scientific value 
nd 
left in their accumulating deposits. In speaking of the Cretaceous 
has left behind it a grand series of monuments on this continent, 
from which may be read all the more important facts of its history. 
In some localities the strata of that age attained a thickness of 3000 
* Ann. Nat. Hist. loc. cit. 
