GEOLEX

Summary of Citation: Addy

Publication:
Weaver, C.E., 1920, The mineral resources of Stevens County
   [Washington]: Washington Geological Survey Bulletin, no. 20,
   350 p., (incl. geologic map, scale 1:125,000)

Usage in Publication:
Addy quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Named	Okanogan province	Quartzite

Summary:
[Named for Addy, sec. 13, T33N R39E, Stevens Co., WA] [no "type" designated by original author] Constitutes Dunn Mountain and crest of Huckleberry Mountains; to east crosses Colville Valley between Chewelah and Addy. Is approximately 150 sq mi. Consists of massive, hard, crystalline, light-colored quartzite, associated with belts of quartz-mica schist, highly metamorphosed banded slates and well banded quartzites with much white mica. Near Addy bands range from few in to several ft. Thickness is over 8000 ft. Overlies Deer Trail argillite (new) and underlies Chewelah argillite (new) and Old Dominion limestone (new); apparently conformably above and below. Is part of Stevens series. Assigned Paleozoic age.

Summary of Citation: Addy

Publication:
Bennett, W.A.G., 1941, Preliminary report on magnesite deposits
   of Stevens County Washington: Washington Division of Mines
   and Geology Report of Investigations, no. 51, 25 p., (incl.
   geologic map, scale 1:62,500)

Usage in Publication:
Addy quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Okanogan province

Summary:
Restricted to exclude underlying greenstone and conglomerate; these units now named Huckleberry greenstone and Huckleberry conglomerate. Thickness at least 3000 ft; may be as much as 5000 ft. Mapped in magnesite belt (north and south halves). Overlies greenstone, but in S overlaps greenstone and overlies schistose conglomerate. Overlain by presumably extensions of Old Dominion limestone that contain fossils of brachiopod (KUTURGINA CINGULATA (Billings) of Early Cambrian age; therefore tentatively assigned Early Cambrian age.

Summary of Citation: Addy

Publication:
Okulitch, V.J., 1951, A Lower Cambrian fossil locality near
   Addy, Washington: Journal of Paleontology, v. 25, no. 3, p.
   405-407

Usage in Publication:
Addy quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Biostratigraphic dating	Okanogan province

Summary:
Olenellid trilobite fragments and brachiopods collected from Addy quartzite near Addy, SW/4 sec. 13, T33N R39E, Stevens Co., WA. Presence of NEVADIA suggest lower portion of Early Cambrian age.

Summary of Citation: Addy

Publication:
Campbell, Ian and Loofbourow, J.S., Jr., 1962, Geology of the
   magnesite belt of Stevens County, Washington, IN Contributions
   to economic geology, 1961: U.S. Geological Survey Bulletin,
   1142-F, p. F1-F53

Usage in Publication:
Addy quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Adopted	Okanogan province

Summary:
Adopted for Stevens Co, WA, as restricted from usage of Weaver (1920) by Bennett (1941) to remove underlying greenstone and conglomerate [now unnamed members of Huckleberry formation. Type locality [designated] near Addy, SW/4, sec.13, T33N, R39E, Stevens Co., WA in reference to fossil locality of Okulitch (1951).Where exposed is thin-bedded, or, less commonly, massive ledge-forming quartzite, bluish-gray to white; distinctive phase has bedding planes emphasized by thin purple bands. Age is Early Cambrian.

Summary of Citation: Addy

Publication:
Miller, F.K., in press, Geologic map of the Chewelah 30' x 60'
   quadrangle [Washington]: U.S. Geological Survey Miscellaneous
   Investigations Series Map, I-__, scale 1:100,000

Usage in Publication:
Addy Quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Biostratigraphic dating	Okanogan province

Summary:
Age of the Addy Quartzite [everywhere] is revised from Early Cambrian to: Late Proterozoic and Cambrian [following the usage of Lindsay and others, 1990] based on regional stratigraphic relations and fossils [trilobites, trace fossils] found well above the base (at least 500 m) of the unit.