U.S. Geological Survey Certificate of Analysis

Cody Shale, SCo-1

Sample used in the preparation of this reference material was collected in Natrona County, Wyoming, near the Naval Petroleum Reserve at Teapot Dome. SCo-1 is typical of the Upper Cretaceous silty marine shales, intermediate between fine-grained offshore shales and coarser nearshore marine siltstones. The rock is a medium dark-gray (Munsel N-4) silty shale having thin lighter colored silty laminations (Flanagan, 1976).

The concentrations were determined by cooperating laboratories using a variety of analytical methods. Values reported are derived from international data compilations (Abbey, 1983, Gladney and Roelandts, 1988, Govindaraju, 1994). Initial USGS reports (Flanagan, 1976) provide background information on sample collection location.

Recommended Values | Certificate Information | Bibliography | Glossary | Notes


Oxide Wt % ± Oxide Wt % ±
SiO2 62.8 0.66 CaO 2.62 0.20
Al2O3 13.7 0.21 MgO 2.72 0.18
Fe2O3 4.19 0.19 Na2O 0.90 0.06
FeO 0.90 0.16 K2O 2.77 0.08
Fe2O3T 5.13 0.18 P2O5 0.21 0.02
TiO2 0.63 0.06
Element µg/g ± Element µg/g ± Element µg/g ±
As 12 1 F 770 60 Stot 630 90
B 72 6 La 30 1 Sb 2.5 0.1
Ba 570 30 Li 45 3 Sc 11 1
Cs 7.8 0.7 Mn 410 30 Sr 170 16
Be 1.8 0.2 Mo 1.4 0.2 Th 9.7 0.5
Ce 62 6 Nd 26 2 V 130 13
Co 11 0.8 Ni 27 4 Y 26 4
Cr 68 5 Pb 31 3 Zn 100 8
Cu 29 2 Rb 110 4 Zr 160 30
Element µg/g Element µg/g
Bi 0.37 Pr 6.6
Cl 51 S 630
Ga 15 Sn 3.7
Nb 11 W 1.4

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Certificate Information

Denver, Colorado
revised March 1995

David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)

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Bibliography

Abbey, S., 1983, Studies in "Standard Samples" of Silicate Rocks and Minerals 1969-1982: Canadian Geological Survey paper 83-15, p. 114.

Flanagan, F.J., 1976, Descriptions and Analyses of Eight New USGS Rock Standards: U.S. Geological Survey Professional Paper 840, 192 p.

Gladney, E.S., and Roelandts, I., 1988, 1987 Compilation of Elemental Concentration Data for USGS BHVO-1, MAG-1, QLO-1, RGM-1, SCo-1, SDC-1, SGR-1, and STM-1: Geostandards Newsletter, 12:253-362.

Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards: Geostandards Newsletter, 18:1-158.

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Glossary

Symbol Definition
Fe2O3T Total iron expressed as Fe2O3
Ctot Total carbon concentration
Stot Total sulfur concentration
Wt % Percent of total element concentration
µg/g Total element concentration expressed as micrograms of element per gram of solid sample
± One standard deviation

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Notes

Unless otherwise indicated total element concentrations are reported for material on an as-received basis, i.e., no drying.

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Order and Pricing Information

This geochemical reference standard is no longer available.

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