Rerinr of Recent (rcohH/lval Literature. 59 
the west, reaching a maximum of about 5U to 75 feet in thickness in the 
upper AVhite river valley, from that point decreasing very rapidly 
westward. The probable source of tlie tuff is a high conical peak 
close west of the 141st meridian, in the northern l)order of the St. 
Elias mountains, (ilacial drift in tiie White river basin reaches only 
about 40 miles north of the present glaciers. 
The paper is published in full by tlie National ( ieograjjliic ^[nga/.ine, 
vol. IV, IS92. ])p. 1 17-lo2, with three plates. 
AV/f///r///.v///> „/■ /,',,' (;lnr;,il l,iik,.- ]V,tn;i,, Ahjinti/n i „ . / nii/iiois. ami 
Ilnrlxoii-I 'liiiiii/ihiiii. r>y \Vai;)!k.v riMi\M. Bulletin, (!. S. A., vol. iir, 
pp. 484-4S7. Ijake Warren, held by the barrier of the retreating ice- 
sheet, extended from the western part of the basin of lake Ontario 
over the upper Laurentian lakes, and outflowed at Chicago to the Des 
Plaines. Illinois, and ^lississippi rivers. When the recession of the 
ice uncovered the .Muhawk valley, lake \\'arren became changed to 
lake lro(|uois. the (rlacial rejjresentative of lake Ontario, and to lake 
A]goii(|uin. wliicli occupied the basin of lake Huron. ]»erhaps also ex- 
tending into the basins of lakes Michigan and Superior, with outflow 
eastward at first through Balsam lake and the river Trent to lake 
Irociuois, and later by the way of lake Xipissing and the ^Nlattawan 
river to the northward expansion of lake Irocjuois in the lower part of 
the Ottawa basin. To this e.xtent the (Ilacial liistory of the Lauren- 
tian lakes liad bt^eii worked out by Sjjencer and (lilbert. beyond which 
Mr. Uplnim considers the question. Where was the ice-sheet latest a 
barrier across the St. Lawrence basin? The directions of glacial 
strite and transportation of the drift show that the ice of that region 
during the closing stage of glaclation was thickest on a belt crossing 
the St. Lawrence in the vicinity of <iaebec. Therefore it is inferred 
that lake Iro(|Uois extended down this vallej' to (Quebec, before the 
ice blockade was removed and the seji allowed to come in. when its 
marine fauna reached nearly to the present mouth of lake Ontario, to 
the south end of Iak(> Cliamplain, and in the Ottawa valley to .Vllu- 
mette island, 75 miles above tlie city of Ottawa. \ (ilacial lake which 
had for a time occupied the valley of the Hudson and of lake Cham- 
plain was merged with lake Iro(|uois by the retreat of the ice from the 
nortiiern side of the ,\dirondack mountains, the level of lake Iro(|Uois 
being at tlie same time lowered about L*")(i feel. 
Sii-iiiiiliirii HiiiiiliiKj ill ^■/((•/■.^■.s•. r>y Wm. II. II<i|'.i;-<. bulletin. <i. S. .\., 
vol. III. i»i). 4()ti-4r)4. with a plate, and 4 iigures in tlie text. Cleavage 
foliation, whicii has been mistaken for sedimentary stratification, is 
described in calcareous muscovite biotite gneiss near the Hojjkins- 
Searles (niarry ill (ireat Harrington. .Mass. Contorted (|uart/. lenses 
and cruni|)led banding. a])proximately at right angles with the folia- 
tion, display the true bedding conforimible with that of the dolomite 
in the (juarry. |)r. ilobbs remarks: "The occurrence of parallel 
layers of different mineralogical composition in a metamorphic clastic 
rock has been considered one of the best criteria in deti'rmiiiiiii: the 
