Alaska Paleontological Database

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PUBLICATION

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Authors:

Nelson, Steven W. , Nelson, Willis H.

Editors:

Date:

/1982

Title:

Geology of the Siniktanneyak Mountain ophiolite, Howard Pass quadrangle, Alaska

MF-1441 , , , 1 Sheet (scale 1:63,360)

Host:

U.S. Geological Survey Miscellaneous Field Studies Map:

Document Type:

Article\Abst.\Chapter\report

Annotation:

UserNote

79ANs2C , Howard Pass , Rubble outcrop of interbedded orange, gray, and green shale. Siliceous orange shale is chief lithology. Lat. 68 deg. 24 min. N., Long. 158 deg. 16 min. W., T. 12 S., R. 27 W., elev. 2600 ft., 5.1 km 19 deg. from VABM Apex. (description from Harris E&R Report of 10/25/1979)[No description given in Nelson and Nelson, 1982; shown as locality 1 of map (Table 1)]

79ANs2E , Howard Pass , Howard Pass B-4. Lat. 68 deg. 24'50" N., Long. 158 deg. 17'10" W. (description from Dover et al., 2004, p. 68 (Table 4))[No description given in Nelson and Nelson, 1982; shown as locality 1 of map (Table 1)]

Radiolarians

78AMH192 , Howard Pass , 15 km 060 deg. from inlet to Desperation Lake, elev. 2150 , T. 12 S., R. 2 E. (lat. 68 deg. 25 min., long. 158 deg. 30 min.). Gray weathering fine-grained marble layer about 10 m thick with no apparent megafossils. Marble from sedimentary sequence structurally below the Siniktanneyak mafic/ultramafic complex. Collected by M. M. Hoare. (description taken from Harris E&R report of 10/11/1978)[No description given in Nelson and Nelson, 1982; shown as locality 2 of map (Table 1)]

79ANs25C (10018-SD) , Howard Pass , Interbedded black shale, green-brown graywacke, purple shale, and gray limestone. Lat. 68 deg. 24 min. N., long. 158 deg. 27 min. W., T. 12 S., R. 28 W., elev. 2300 ft., 7.0 km from VABM Apex.(description from Harris E&R report of 10/25/1979) [Dover et al., 2004, p. 68 (Table 4) provide following description: "Howard Pass B-5. Lat. 68 deg. 24'18" N., Long. 158 deg. 27'11" W."][No description given in Nelson and Nelson, 1982, shown as locality 3 of map (Table 1)]

Conodonts

78ANk35 , Howard Pass , Howard Pass B-5. Lat. 68 deg. 22'52" N., Long. 158 deg. 38'35" W. Fossils are probably in tectonic inclusions; locality described as melange by collector. (description from Dover et al., 2004, p. 68 (Table 4))[No description given in Nelson and Nelson, 1982; shown as locality 4 of map (Table 1)]

Brachiopods

79ANs41D , Howard Pass , Gray limestone interbedded with pillow basalt. Lat. 68 deg. 21 min. N., long. 158 deg. 16 min. W., T. 34 N., R. 3 E., elev. 2000 ft., 3.1 km 141 deg. from VABM Apex. (description from Harris E&R report of 10/25/1979)[No description given in Nelson and Nelson, 1982; shown as locality 5 of map (Table 1)]

79ANs41E (10041-SD) , Howard Pass , Lat. 68 deg. 21 min. N., Long. 158 deg. 16 min. W., T. 34 N., R. 3 E., Howard Pass (B-5) quad., elev. 2080 ft., 3.0 km 142 deg. from VABM Apex. On south bank of creek. (description from Oliver E&R report dated 10/31/79)[No locality description given in Dutro E&R report of 10/31/79] [Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 21' N., Long. 158 deg. 16'15" W. Sample 92ADE (table 1) from approximately this locality contains conodonts of middle Frasnian age."][No description given in Nelson and Nelson, 1982; shown as locality 6 of map (Table 1)]

Stromatoporoids

Corals

79ANs41C (10019-SD) , Howard Pass , Gray limestone pods in mafic volcanic rocks structurally below gabbro. Lat. 68 deg. 21 min. N., long. 158 deg. 15 min. W., T. 34 N., R. 3 E., elev. 1980 ft., 3.5 km 142 deg. from VABM Apex. (description from Harris E&R report of 10/25/1979) [Dover et al., 2004, p. 69 (Table 4) provides following description: Howard Pass B-4. Lat. 68 deg. 20'56" N., Long. 158 deg. 16'00" W."][No description given in Nelson and Nelson, 1982; shown as locality 7 of map (Table 1)]

Conodonts

79ANs41A , Howard Pass , No Data given in Mamay E&R report of 1/11/1983 [No description given in Nelson and Nelson, 1982; shown as locality 8 of map (Table 1)]

Plants

78ANs205B , Howard Pass , 9 km 015 deg. from inlet to Feniak Lake, elev. 2840, T. 34 N., R. 3 E. (lat. 68 deg. 22 min., long. 158 deg. 20 min.). 8-m thick dark-gray limestone with no megafossils in a 200-m thick sequence of dark-gray pillow basalt. Pillow basalt sequence structurally below the Siniktanneyak mafic/ultramafic complex. Collected by S. Nelson. (description from Harris E&R report of 10/11/1978) [Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 20'42" N., Long. 158 deg. 17' W. Collected from limestone within Copter Peak basalt unit of Siniktanneyak mafic complex."][No description given in Nelson and Nelson, 1982; shown as locality 9 of map (Table 1)]

Conodonts

78AMH-194A , Howard Pass , Alaska, Howard Pass B-5 quad., T. 34 N., R. 2 E.; 68 deg. 21 min. N., 158 deg. 16 min. W; 8 km NNE of inlet to Feniak Lake; interbedded black shale and brown-weathering fossiliferous limestone. Collector: Marti M. Hoare, 1978. (description from Dutro E&R report of 03/01/1979)[Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 19'44" N., Long. 158 deg. 16'16" W.".* (*latitude/longitude herein corrected from previously published version)][No description given in Nelson and Nelson, 1982; shown as locality 10 of map (Table 1)]

Echinoderms

Brachiopods

Sponge(?)

78AMm-035C , Howard Pass , Alaska, Howard Pass B-5 quad., T. 34 N., R. 2 E.; 68 deg. 21 min. N., 158 deg. 20 min. W.; limestone lenses and pods in basalt, containing rare megafossils. Collector: M. Mullen, 1978. (description from Dutro E&R report of 3/1/1979) [Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 20' N., Long. 158 deg. 19'23" W. Collected from limestone within Copter Peak basalt unit of Siniktanneyak mafic complex."][No description given in Nelson and Nelson, 1982; shown as locality 11 of map (Table 1)]

Corals

Brachiopods

78AMm035D , Howard Pass , 7 km 008 deg. from inlet to Feniak Lake, elev. 2000, T. 34 N., R. 2 E. (lat. 68 deg. 21 min., long. 158 deg. 20 min.). Limestone lenses and pods in pillow basalt. Sequence structurally below the Siniktanneyak mafic/ultramafic complex. Collected by Mile Mullen. (description from Harris E&R report of 10/11/1978 [Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 20' N., 158 deg. 19'23" W. Collected from limestone within Copter Peak basal unit of Siniktanneyak mafic complex."][No description given in Nelson and Nelson, 1982; shown as locality 11 of map (Table 1)]

Conodonts

79ANs31A , Howard Pass , Lat. 68 deg., 20 min. N.; Long. 158 deg., 19 min. W. Gray, green, or black weathering chert and shale, interbedded with fossiliferous shaley limestone. (description from Jones and Murchey E&R report dated 7/1/80) [No locality description given in Dutro E&R report of 10/31/79] [Dover et al., 2004, p. 69 (Table 4) provides following description: Howard Pass B-4. Lat. 68 deg. 19'20" N., Long. 158 deg. 19'05" W."][No description given in Nelson and Nelson, 1982; shown as locality 12 of map (Table 1)]

Radiolarians

Pelecypods

79ANs31B , Howard Pass , 30 m thick section of siliceous shale or chert, gray, green and black weathering, interbedded with gray limestone and buff-weathering fossiliferous shaley limestone. Collection is a few meters below overlying brecciated dunite. Megafossils submitted to Dutro. Lat. 68 deg. 20 min. N., long. 158 deg. 19 min. W., T. 34 N., R. 2 E., elev. 2300 ft., 5.9 km 181 deg. from VABM Apex. (description from A.G. Harris E&R report of 10/25/1979)[Dover et al., 2004, p. 69 (Table 4) provides the following description: "Howard Pass B-4. Lat. 68 deg. 19'20" N., Long. 158 deg. 19'05" W."][No description given in Nelson and Nelson, 1982; shown as locality 12 of map (Table 1)]

Conodonts

78ANs-135B , Howard Pass , Alaska, Howard Pass B-5 quad.; T. 34 N., R. 2 E.; 68 deg. 19 min. N., 158 deg. 20 min. W.; 6 km N of inlet to Feniak Lake; purple weathering, laminated, weakly calcareous siltstone interbedded with orange-weathering fossiliferous limestone. Collector: S.W. Nelson, 1978. (description from Dutro E&R report of 3/01/1979)[Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68 deg. 18'58" N., Long. 158 deg. 18'58" W."][No description given in Nelson and Nelson, 1982; shown as locality 13 of map (Table 1)]

Echinoderms

Corals

Brachiopods