52 21ie Aniericuni (iealoijisf. January, 1895 
Mario. NiixMlistincl deltas arc mentioned at Duiuth as liaving been 
made by Ciiester creek at different staj^es of these lakes. u. s. o. 
The lltcrzoHte-Kcrpcutinc mid (tssocuitcd rorl.x of tin' Potrcro, S(t/i Fran- 
cisco. By Chakles I^.vi,.\i'IIK. (JJidl. Dept. of (ieol.. Univ. of Califor 
nia, vol. i, no. 5. pi). lGl-180, Aug., 1804.) A rather detailed account of 
thisserpenline is given in order to disprove the supposition that there 
are no serpentines of igneous origin in the Coast ranges. It is shown 
that the rock was originally a Iher/oiilc. i. c, was comi)osed chi(»f!y of 
an aggregate of enstat it c, diallagf and olivine, unaltered portions of 
which minerals are still to be seen. Cutting this Ihcr/.olite-serpentine 
are masses of hyperstlicne diabase and ei)idiorite, the hornl)lende of the 
latter being probably secondary after pyroxene. r. s. o. 
On a rock from f/ic rici/i/'fi/ of Ih'rkilcti con1(tiniiiii a ticir soda (imphiholc. 
Hy Chaules Palac'IIE. (Bull. Dept. of (Jeol., T'liiv. of California, vol. i, 
no. G, pp. 181-192, pis. 10-11, Aug., 18JU.) The material studied comes 
from a large boulder, which is probably near its i)arent ledge, about 
three miles north of Berkeley. The rock has a white matrix of saccha- 
roidal albite, in which matri.x are prisms of a blue amphibole. An in- 
vestigation shows that this mineral is intermediate in chemical compo- 
sition between glaucophane and riebeckite, that it is similarto the latter 
mineral in thi; relation of the axes of optical elasticity to the crystallo- 
graphic axes, but that the extinction angle is about twice that of 
riebeckite; the pleochroism is also a litth- different from that of riebeck- 
ite. Since an almost exactly similar amphibole, as far as optical prop- 
erties are concerned, has been reported from Colorado by Dr. Whitman 
Cross (Amer. Jour. Sci., Ill, xxxix, .'}59-;570, I8J)0), the author proposes 
the name crosdte for the mineral here described. The ('oast ranges of 
California have long been known to contain schists with ablue amphib- 
ole, which has been referred to glaucophane, but which it is believed 
will be found to be largely crossite. r. s. <!. 
The Qreat Ice Age tiiid itx rclalioii to the Anta/uiti/ if .Win. By James 
Gkikie. Third edition, largely rewritten. Pages xxviii, 850, with 18 
maps and charts, a, frontispiece, and 78 woodcuts, including numerous 
full page illustrations, in the text. (London: Edward Stanford, 20 & 27 
Cockspur street. Charing Cross, S. W., 1894.) First publislied in 1874. 
about a .year before the closely related treatise 1)\ Dr. James Croll, 
Climate and Time, this work was largely (>xfen(led in its second edition 
(1877), and the same author four years lat,er presented a continuation of 
his studies of the Glacial and Postglacial periods, in his almost equally 
notable volume. Prehistoric Europe. During the thirteen years which 
have jtassed since then, he has been industriously adding to his data 
for the present new edition, which has 225 i)ages more than the second. 
Its most regrettable omission is the appendix, apiieariiig in the first and 
second editions but not, in this, entitled "List of the fossil organic re- 
mains of the glacial dejiosits of Scotland," by Robert Etheridge. Jr.. 
with l)ibliognii)hic references and concise descriptive notes of most of 
