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U.S. Geological Survey
Open-File Report 2006-1068
Version 1.0

Conodont and Radiolarian Data from the De Long Mountains Quadrangle and Adjacent Areas, Northern Alaska

By Julie A. Dumoulin, Anita G. Harris, Charles D. Blome, and Lorne E. Young


thumbnail of a page of SEM photos of conodonts

This report presents biostratigraphic data from 289 collections at 189 localities in the De Long Mountains, Misheguk Mountain, and Noatak quadrangles (fig. 1); most of these data have never been previously published. The collections were made during studies of the Red Dog massive sulfide deposit in 1998–2004 and in support of regional mapping projects in 1979, 1981, 1983, and 1997–98. The collections—mostly conodonts and some radiolarians—tightly constrain the age of many stratigraphic units of Devonian through Triassic age exposed within the study area, and provide additional data on the depositional environments and thermal history of these rocks.

The data are presented in a series of tables, organized by fossil type, stratigraphic unit, and location. Tables 1–12 contain conodont data, mostly from the De Long Mountains quadrangle. All of these collections were initially examined, or were reevaluated, from 1997 through 2004, and complete faunal lists are given for all samples. Table 13 lists ages and conodont color alteration indices (CAIs) of 27 collections from 24 localities in the Noatak quadrangle; updated faunal lists were not prepared for these samples. Radiolarian data—all from the De Long Mountains quadrangle—are given in table 14; these collections were analyzed between 1998 and 2003.

Collection localities are shown in four maps (sheets 1, 2). Map 1 (sheet 1) shows all outcrop samples from the De Long Mountains and western Misheguk Mountain quadrangle (locs. 1-121). Maps 2–4 (sheets 1, 2) show all drill hole sample localities; samples come from the Su-Lik deposit and in and around the Anarraaq deposit (map 2, locs. 122–135), in and adjacent to the Red Dog deposits (Paalaaq, Aqqaluk, Main, and Qanaiyaq) (map 3, locs. 136–158), and from drill holes along the Port Road in the Noatak quadrangle (map 4, locs. 159–160). Map 4 (sheet 2) also shows all outcrop samples from the Noatak quadrangle (locs. 161–189).

The text summarizes the lithofacies, age, and biofacies of the Paleozoic and Mesozoic stratigraphic units that produced the fossil collections presented in the tables. Many of the data for the Lisburne Group are taken from Dumoulin and others (2004). Plates 1–4 illustrate important conodonts from the collections listed herein, as well as from coeval collections in the Howard Pass quadrangle; information about the Howard Pass conodonts is given in Table 15.

Download the text of this publication as a 174-page PDF file (of2006-1068_text.pdf; 4.2 MB).

Go to the Plates folder. This folder contains the four plates as large PDF files and thumbnail versions of the plates as small JPG file (of2006-1068_plates, 8 files; 170 MB total).

Go to the Sheets folder. This folder contains the two sheets. There are three maps on the first sheet and another map on the second sheet (of2006-1068_sheets, 2 files; 17.5 MB total).

Read the metadata for this publication. (of2006-1068_metadata.txt; 16 KB).

Download the GIS data for the sheets. This compressed file contains .ai files for both sheets, a copy of the metadata file linked above, and four GIS data files (fossils.dbf, fossils.e00, fossils.shp, fossils.shx) (; 24.2 MB compressed, 24.9 MB uncompressed).

For questions about the content of this report, contact Julie Dumoulin

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Maintained by: Michael Diggles
Created: May 15, 2006
Last modified: January 8, 2008 (mfd)