Geology and Mineralogy. 395 
sea-level); and concludes that the idea of the excavation of 
Ontario to a depth of 600 feet by glacier action is wholly unten- 
able, and that the theory of glacial elapse for the chain of 
m the occurrence in North America iY. rare Extinct Verte- 
eh pron Sragmentarily in ‘Bnsfnil —Professor R. Owen has 
a paper with this title in the Annals and Magazine of Natural 
History for September, 1878. It treats first of the “ Restoration 
of Chondrosteosaurus,” to which he refers Cope’s Camarosaurus, 
and secondly of the Restoration of Coryphodon. In the remarks 
on the latter rt Aaa first pers ae by Professor Owen, the anther 
many points of interest, and gives credit to Professor 
Marsh’s discoveries for the chief part of the facts upon which they 
are based. ‘he paper has the following concluding sentence. 
“To the close and careful comparisons of the conscientious palzon- 
tologist of Yale College, we are indebted for the above interesting 
and unexpected additions to our knowledge of the rare and ancient 
Tertiary mammal, fragmentarily indicated in the ‘ plastic clay’ of 
England (1845) and in the ‘conglomérate de largile plastique’ 
at Mendon, France (Hébert, 1856), of the elements toward a res- 
toration of. which we might have long remained in doubt had they 
continued to be made known to us as parts of a Bathmodon or 
Loxolophodon, 
On the EHrupted Rocks of Colorado ; by J. M. Enpuicn. 
2 pp., 8vo. From the 10th Annual Report of the United Stakes 
Geokegiol Survey under Dr. F. V. Hayden, United States Geolo- 
gist-in-charge.—Mr. Endlich classifies and describes the eruptive 
tocks of Colorado, their relation to the veins of ore, their age and 
origin, 
I pr Che 
1863; 3, Hivrin & Prarrius, Verh. Ges. Freib. im Br., ii, 1861; 
4, Dexxssz, Bull. Soc. Geol. de France, I, vi, 547, 1849; 5, of a 
Specimen from Neurode, Silesia, Vom "Rava, om : 
955, 1855; 6, C. F. Cuanpier, Inaug. Dissert. Gott., 1856 (from 
Zobten, Silesia); 7, 8, of a lavender-blue variety, in euphotide of 
the Isle of Unst, M. Foster Heppwe, Min. ag., Truro an n- 
don, April, 1878; 9, De.essx, Ann. d. Mines, LV, a 116, 1850; 
_ th peared 
im the Ann, des Mins III, viii, a 1835; he eaten Si0, . — 
—— 320, MgO 2-4, CaO 21-0, K,0 1°6=100°6 
analyzed a saussurite from Mt. per obtaining SiO, ek 
#1O, 30-4, MgO 2°5, CaO 15°5, Na,O 75 5=100°6, showing an 
approximation to Delesse’s results and a composition near that of 
