50 The American Geologist. July, i896 
sandstones of San Juan have i)roduced no fossils. The horizon of the 
Upper Helderl)org and Hainilt(ni groups in the same region is indicated 
by the ubiquitous Lejitocoelia fldbellites and species of the genera 
RhynchonclUi. Mcristella, Spirifer, Strophomena, Choiietes, etc. (These 
fossils have not as yet been studied with precision so that their exact 
value is still undetermined.) Upper Devonian sandstones with plant 
remains overlie these. The Carboniferous sandstones and conglomer- 
ates with productive coal beds and numerous plant remains occur in 
the same districts. Overlying are beds, also coal-bearing, with Wal- 
chia, Noeggerdthiopnis, and other plants rejjresenting the Permian. 
J. M. c. 
^4 Mineralogicol Lexicon of Franklin, HampHhire, and Hampden 
coimties, Massachusetts. By B. K. Emerson. (Bull. No. 126, U. S. 
Geol. Sur., pp. 180, pi. 1, 1895.) Nothing quite so elaborate and com- 
prehensive has heretofore appeared in the United States in the form of 
a mineralogical catalogue pertaining to a relatively small area. The region 
is a historic collecting ground : Profs. Amos Eaton, Chester Dewey and 
Ebenezer Emmons early entered it. The more precise investigations 
of president Hitchcock have given it geological importance, while Prof. 
C. U. Shepard's keen-eyed search for its minerals during more than a 
half-century has made its localities known to all mineralogists. Prof. 
Emerson states that his catalogue was intended to accompany his geo- 
logical monograph of the same district, but is allowed to appear in 
separate form on account of its large size. The general plan of the 
catalogue is an alphabetical arrangement of recognized and well estab- 
lished mineral species, under each caption Ijeing references to all names 
under which the species has been cited from localities within the dis- 
trict. Mineralogists will appreciate the comjjlete literature of these 
species not less than the determination of the exact values of many 
mineral names applied, especially by Shepard, to forms from this 
region. J. m. c. 
Traces of the Ordovician Sijstem on the Atlantic Coast. By G. Y\ 
Maithew, D. S. (Transactions of the Royal Society of Canada.) In 
this tract Mr. Matthew, after mentioning a belt of Ordovician rocks ex- 
tending from the bay of Chaleur across New Brunswick into the state 
of Maine, south of the belt of Silurian rocks already known, and an- 
other near St. John, gives an account of a third belt of Ordovician strata 
lately identified by its fossils on the island of Cape Breton and in Con- 
ception ba^, Newfoundland. The material is scanty and not very well 
preserved, but in Mr. Matthew's opinion clearly indicates the presence 
of this fauna farther to the eastward than it has hitherto been recog- 
nized in America. It consists of a few lingulids, a trimerellid, an obo- 
lid and an orchid, a Hyolithes and a trilobite. Good figures accompany 
the paper. e. w. c. 
A Summary of Progress in Mineralogy in 1895. By Wm. H. Hobbs. 
(From monthly notes in the American Naturalist. Madison, Wis., 1896. 
Price 50 cents.) Dr. Hobbs has had reprinted and collected in conven- 
gnt form his useful notes on mineralogy from the American Naturalist 
