24 TRANSACTIONS OF THE * fog aaa, 
NOTES ON THE AREAL GEOLOGY OF GLACIER 
BAY, ALASKA. 
EH. 3P; (CusHEINeG. 
CONTENTS. 
Am brodUchion 2.5. 02). nececcssemcocencseesaties cece centecoas cess career secre eet ee ke ete 
General <Geoloo yin ccccmewncisits vir osere ce seeeetoielecisleississieiis oe cieeo leis cidasestcte ese ate eet 
The Aroalibess snc ce. noses sans cetiemmeanenceetsecicersasscce eck cass Jeera Eee 
The’ Glacier Bay; IcimlestOne: -.cvsc.ccswecssssisceece ss «occ sceees eu eecee cer seteee eee 
The Qaartz-Glorite .: oo. cco .ccccccscntcecssssnesscesssccnoscstesesmeteceeestt teen 
ID AONE. Goncaecon Roseit obisetveieseass thee ose tueose Cac eta dowecionG non = eeteltenioe re eeea te eee 
Crystalline ‘Schists.-.. 2. <)cicdve sefcesawsocusetscte csi dcesb ese nense chante ddseneceeeeeene 
MDDS vers srtcieitatealene dieses apes etnseia ols cove el sieteleleaelss onto slseeseien ceases sees eeee eee 
Comparison with other Alaskan Sections..............s6+ oe\scosiesassaenaeu Seseeend : 
Petro Pe rApUICA NOLES... ceca. s casenee se cnucessceseces sae seen scadeeeextgone eee: = sean 
THE QuartZ-Ci OLLbC sos ols cvee Seto svc «ones cic nae seaees toneele tenes eucleceemeeeeneeetnene 
MES SCHISHS..2o ais. oese vdcde oe stedone ecco tdes tuslssusscdcceserssy seus eetcodccomsaenemameas 
EDP MC SD UC OS) rscanice'e sain ste vio wialacie vivin 9 No vctslosclaw alee elem vise alalds reise aaea oe cee Meee eee ee 
Plate I. at close of Volume. 
INTRODUCTION. 
In the year 1890 a party under the leadership of Dr. H. F. 
Reid explored and mapped a considerable portion of the basin 
of the Muir glacier in southern Alaska. The writer was a mem- 
ber of the party and reported briefly to Dr. Reid on the areal 
geology of the district.* 
In 1892 Dr. Reid returned to Glacier Bay and extended his 
work over a much greater area, exploring and mapping for the 
first time the shores of the upper part of Glacier Bay, an under- 
taking of the most laborious character. 
From these newly explored shores Dr. Reid gathered rock 
samples whenever practicable, upon which he has requested a 
report. These specimens prove with a singe exception, to repre- 
sent rocks similar in all respects to those already described from 
the vicinity by Dr. Geo. H. Williams and the writer. It has 
seemed, however, that a brief review of the whole matter, with 
such comparisons as can be made with sections reported else- 
where from southern Alaska, may not be wholly devoid of value. 
GENERAL GEOLOGY. 
In 1891 the writer described from the Muir glacier basin an 
argillitic series and a dolomitic limestone, both of great thick- 
ness, and both cut by eruptives, in part as great intrusive masses, 
*Nat. Geog. Mag., Vol. IV., pp. 56-62. 
