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Aroostook Co., Maine, USA

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 46° 39' 31'' North , 68° 35' 55'' West
Latitude & Longitude (decimal): 46.65881,-68.59889

A large county with extensive forest cover. Bedrocks are low grade metasediments with some intrusive rocks. Area is noted for numerous manganese prospects. Manganese ores vary from manganoan magnetite through braunite and rare species.

Note: The geographic coordinates presented are taken from the Little Machias Lake topo map. The USGS GNIS database presents 163 sets of coordinates for this county.

Mineral List

Mineral list contains entries from the region specified including sub-localities

64 valid minerals. 4 erroneous literature entries.

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

407.6 - 410.8 Ma

ID: 2798078
Devonian Seboomook Formation

Age: Early Devonian (407.6 - 410.8 Ma)

Stratigraphic Name: Seboomook Group

Comments: Named as a formation for Parker Bog Ponds, southwest part of Pierce Pond quad, northern Somerset Co., western ME. Type section is at Parker Bog Ponds. Occurs in a narrow belt 8 mi long. Consists of interbedded light-gray limestone and white-weathering, flinty, fossiliferous felsite (tuff) in beds a few inches to a few feet thick. Thickness is about 200 ft. Conformably overlies undifferentiated Silurian and Devonian strata suggested by parallel bedding; actual contacts not observed. Report includes geologic map and correlation chart. (ME003) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; Protolith N - Limestone and/or dolostone.

Lithology: Major:{mudstone,sandstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region


This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Miller, Ralph L., 1947, Manganese Deposits of Aroostook County, Maine, Bulletin 4, Maine Geological Survey, Augusta, Maine, pp. 77 + plates.

Pavlides, Louis and Milton, Charles, 1962, Geology and Manganese Deposits of the Maple and Hovey Mountains Area, Aroostook County, Maine, USGS Professional Paper 362, pp. 116 + plates.

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