134 
The American Geologist. 
December, 1905, 
map of the environs of Philadel- 
phia (ed. com.), xxvl, 391; Dit- 
to, S. H. Hamilton, xxvll, 41; 
Gerard, Sketch of, L. C. Glenn, 
xxxv, 72. 
Truckee formation, (Am. com.), II, 
293 
True, F. W. t (p.s.n.), xx, 204. 
True, H. L., Cause of the glacial 
period, (rev.), xxxi. 384. 
Tschernyschew, T. H., Devonian 
fauna of the Altai, (rev.), xii, 
335. 
Tucumcari mountain, W. P. Cum- 
mins, xi, 375; Cerro, Jules Mar- 
cou, xii, 103. 
Tuff beds of the Trias, the mud 
enclosures and basic pit stones of 
the Triassic traps, B. K. Em- 
erson, (abs.), xviii, 220. 
Ti -mer, Peter von, (p.s.n.). xxxii, 
264. 
Ti'm-ey, Michael, (cit.), iv, 189; 
Sketch of, E. A. Smith, xx, 206; 
Turner, H. W., Geology of Mt. Di- 
ablo, Calif., (rev.), viii, 117; Re- 
cent contributions to the geology 
of Calif., xi, 307; Mesozoic gran- 
ite in Plumas county, xi, 425; 
Notes on the Sierra Nevada, 
xiii, 228; 297; (and T. W. Stan- 
ton), Notes on the geology of the 
coast ranges of Calif., xiv, 92; 
Auriferous gravels of the Sier- 
ra Nevada, xv, 371; Archaean 
Gneiss in the Sierra Nevada, 
(abs.), xvii, 344; Syenitic rocks 
from Calif., xvii, 375; Rocks and 
minerals from Calif., (rev.), xxii, 
377; Igneous, metamorphic and 
sedimentary rocks of the Coast 
Ranges, (rev.), xxii, 3S1; Geology 
of the Yosemite National park, 
(abs.), xxiii, 100; Diamonds in 
Calif., xxiii, 182; Some rock- 
forming biotites and amphi- 
boles, (rev.), xxiv, 181; Oc- 
currence of Roscoelite, (rev.), 
xxiv, 318; The Esmeralda forma- 
tion, xxv, 168; Nomencla- 
ture of feldspathic granolites 
(rev.), xxvii. 53; Geology of 
the great basin, in Calif, 
pnd Nev. (abs.). xxvii, 132; 
Sketch of the historical geology 
of Esmeralda county, Nev. xxix, 
262. 
Twitchell, M. W., (p.s.n.), xxxvi, 
60. 
Two, systems confounded with the 
Huronian, A. Winchell, iii, 212; 
Ditto, Selwyn, iii, 339; 
Belts, Black shale in tbe Trias- 
sic of Conn.. Davis and Loper, 
(rev.), viii, 118; 
Montana coal fields. W. H. 
"Weed, (rev.), x, 181; New species 
of Lichas, E. O. TJlrich, x, 271; 
Neocene Rivers of Calif., W. 
Lindgren, (rev.), xii, 121; New 
occurrences of corundum in North 
Carolina, J. H. Pratt, (rev.), xxvi, 
393; New genera and new species 
of fossils from the Paleozoic of 
Missouri. R. R. Rowley, xxvii, 
343; Islands and what came of 
them. Thomas Condon, (rev.}, 
xxxvi, 122. 
Type fossils, of the American mu- 
seum (if natural history, (p.s.n.), 
xxix, 130; of Aviculipecten, "W. 
Hind, xxxiv, 200; Ditto, G. H. 
Girty, xxxiv, 332. 
Typical, eskers of southern New 
England. H. B. Woodworth, 
(rev.), xiv, 396; species of Avi- 
culipecten, G. H. Girty, xxxiil, 
291. 
Tyrrell, J. B., Journeys of David 
Thompson, (rev.), i, 256; (p.s.n.), 
iv, 63; Post-Tertiary of Man- 
itoba, (abs.), v, 119; Note and 
map of Duck and Riding Mount- 
ains, (rev.), v, 241; Pleistocene 
of the Winnipeg basin, viii, 19; 
Deep well, Deloraine, Manitoba, 
xi, 332; Pleistocene east of Atha- 
basca, (abs.), xi, 132; Pleisto- 
cene phenomena east of Athabas- 
ca, (abs.), xi, 175; Exploration 
west of Hudson Bay, (p.s.n.), 
xiii, 132; Northwestern Manitoba, 
(rev.), xiii, 430; Pleistocene west 
of Hudson Bay, (rev.), xiv, 338; 
(p.s.n.), xvi, 198; Ice sheets of 
Canada, (abs.), xx, 200: Doo- 
baunt, Kazan and Ferguson 
Rivers and coast of Hudson 
Bay, (rev.), xxi, 128; (p.s.n.), 
xxii, 394; Gold mining in the 
Klondike, (abs.), xxiii, 101. 
U 
Udden, J. A., Megalonyx beds in 
Kansas, vii, 340; Natural forma- 
tion of pellets, xi, 268; Loess as a 
land deposit, , (abs.) xx, 194; 
Origin of the loess, xx, 274; A 
new well at Rock Island, III., xxl, 
199; Preglaeial soils, (abs.) xxl, 
262; Interglacial deposits in Iowa, 
(rev.) xxii, 326; Note, xxiii, 380; 
(p.s.n.), xxxii, 331; Geology of the 
Shafter silver mining district, 
(rev.), xxxv, 1^2; Proboscidean 
fossils of the Pleistocene deposits 
in 111. and la., (rev.), xxxvi, 258. 
Ueber, some fish remains of the 
Bohemian Devonian, A. v. Roemer, 
(rev.), xvi, 410; Paleozoic fauna 
of Asia and North Africa, F. 
Freeh, (rev.), xvi, 261; Post 
Archaean Granite of Sulitelma. O. 
Nordenskjold, (rev.), xvi, 320; 
Organisms in the Archaean rocks 
of Brittany, H. Rauff. (rev.) xvii. 
396; Die Graptoliten; Inaugural 
dissertation, C. Wiman, (rev), 
xvii, 115; Pre-Cambrian micro- 
cystallines in Smaland, O. Nord- 
enskjold, (rev.), xvii. 179; Die 
Beziehungen der fossilen Tabu- 
laten zu der Alcyonarien. F. W. 
Sardeson, (rev.), xviii, 37; Die 
Brachiopodengatttung Obolus, 
a^chwald, A. Mickwitz, (rev.), 
xviii, 264; Cambrische und Si- 
lurische Phosphorit fuhrende 
Gesteine aus Schweden. J. G. 
Andersson, (rev.), xix, 137; Die 
