Preliminary geologic report of Sadlerochit River area, 1948

Abstract

on June 12, From this place the ?arty moved cevgp by back-packing, f~U & n g the r*aute indicated by camp locations, until they reached the eastern end of Lake Schrad.er on July 50 The vzious c a p sites were selected at or near caches that had previously been set out, so that it was not necessary to transport aryr food rqhi3,e marring cmp, canvas boat w i t h a s i d l o~t b w c. l motor, wk,ichs had becn cached previousu, was used for trsulsr>ol-tetiun on Zdce 2etsrs a d Lake Schrader, On J&J 7 George Cmyc a i d I;leyd Spetzimn jsined tb pWQat Lake Scbzader, & r , ifryc ~erscLneci with e~e party-m.i;U 2X~y 17, making nztsrid. contribations to the i:eolo[;ic s5udi.c~ i n t>.e 16cdnjiy of Lake Schra.des, G r , Spete~:~aiz, a b o t z s i s t working f o? t h e Arctic b 3 .

Post-Carboniferous stratigraphy, northeastern Alaska

“…During 1947-53 and in 1968 the U.S. Geological Survey conducted reconnaissance geologic surveys of small parts of the area. Reports by Gryc and Mangus (1947), Whittington and Sable (1948), Morris (1953) …”

Radioactivity of selected rocks and placer concentrates from northeastern Alaska

“…2) as granite(? ), was found by Whittington and Sable (1948, fig. 1) to consist instead of preCambrian(?)…”

Jurassic paleobiogeography of Alaska

“…Graywacke and tuff are present locally in the central part (Chapman and others, 1964;Jones and Grantz, 1964;Patton and Keller, 1954;Tailleur, 1954, 1964). The only good exposures for this part of the Jurassic are in northeastern Alaska (Brosge and Tailleur, 1970;Detterman, 1973;Gryc, 1951;Gryc and Mangus, 1954;Keller and others, 1961;Leffingwell, 1919;Reiser and Tailleur, 1969;Reiser and others, 1970;Sable, 1965;Whittington and Sable, 1954), where a major middle Bajocian to early Bathonian unconformity can be detected both lithologically and paleontologically (Imlay, 1955(Imlay, , 1970. Elsewhere in northern Alaska, the rocks are too poorly exposed to determine the presence of unconformities.…”