The Geologic History of Missouri. — Wiiisloic 81 
Johann David Schoepff and liis conlribiitions toNortli American i^c-u- 
logy. Bull. Geol. Soc. Am.-r.. ISDH. w. 5<)l-594. 
Mines and minerals of Maryland. Maryland ^yorld's Fair Bodk, KS!)."!. 
Piedmonti;e and Sclieelite from the ancient Rlivolite of South M;)unt- 
ain, Pa. Am. Jour. 8ci., July, 1893, vol. XLVI, p. .30 
Recent contributions to the subject of dynamo-meVamorpiiisin . .ioiir. 
of Geplosy. vol I. p. 580. 18!)a; review. 
The distribution of ancient volcanic rocks alonuthc i-astern bordci- of 
North America. Jour, of Geology, vol. II, No. 1. pp. 1-:!1, pi. 1, 18!)4. 
Sixth annual excursion of the (Jeolonical Department. Univ. C'irc. 109. 
p. 2G, February, 1894. 
The Columbian Exi>ositioii. Notes on various exhibits relative to 
mineralogy and [)e1rography. Am. Geologist, vol. XlII, No. 8, pj). :{4.>- 
353, May, 1894. 
On the natural occurrence of Lapis-Lazuli. Univ. ('ire. 114, ]>. 111. 
July, 1894. 
Sixty-eight reviews cjf .American geological and petrugrapliical liter- 
ature, published in the Neues Jahrbuch fur Mineralogie, (ieologie und 
Palaeontologie, between 1884 and 1890. 
The Williams family, tracing the descendants of Thomas AVilliams, 
of Roxbury, Mass. N. P^ng. Hist. Reg.. 1880. Reprinted for private dis- 
tribution. 
and W. M. l^urton. 
On the crystal form of metallic /.inc. Am. ('hem. .lour.. XI. Xo. 4. 
and Wm. 15. Clark. 
Geology and minei-al resources of Maryland, with geological map. In 
the book "Maryland." published by the Stale Roard of Managers for 
the World's Fair Commission. .Inly, 189:5. 
and N. II. Dartoii. 
Baltimore Atlas Sheet, (ieologie Atlas of the I'nited Stales, U. S. 
Geol. Survey. 
THE GEOLOGIC HISTORY OF MISSOURI.* 
By Aktiiuk Winslow, St. Louis. Mo. 
liitrodHction.- — The geology of Missouri has now been 
studied for a period of half a century. Though luuch detail 
yet remains to be worked out, its general features are known ; 
the periods to which the formations belong have, in the main, 
been determined and their structure is understood. We are, 
therefore, in a position to narrate with some confidence 
many facts of the geologic history of the state. In the pres- 
ent state of our knowledge of such a complicated subject, it 
is, however, not always possible to make positive statements. 
But, in such cases, much can be said which is at least sug- 
*Read bv title at the Hrooklvn meeting of the (ieoloirical Socii'tv of 
America, Aug.. 1894. 
