Mt. Arvon
       7 ½’ quadrangle: Skanee South, MI
       Baraga County
       Private Land

Igneous
1,979 ft (603 m)

Bedrock: Unnamed granitic rocks (not exposed at very summit)

Archean

Medium- to coarse-grained, weakly foliated granodiorite and tonalite. In part, porphyritic with microcline megacrysts. Biotite, garnet and chlorite are accessory. Similar rocks hold up the summit of Mt. Curwood, formerly thought to be the highest point (elevation 1978 ft). To the north the granodiorite is in fault contact with the lower Proterozoic Baraga Group, which consists of pyritic black shales and graywackes.

Surficial Geology: Wisconsinan glacial till.

Soil Series: Munising/Michigamme complex: hilly and steep, well drained pedalfer soils. Munising: black fine sandy loam over pinkish-gray to dark reddish-brown subsoil. Michigamme: dark reddish-brown cobbly silt loam. Both derived from weathered glacial till.

Selected References:

• Berndt, Loren W., 1988, Soil Survey of Baraga County, Michigan , U.S. Soil Conservation Service.
• Cannon, W.F., 1986, Bedrock geologic map of the Iron River 1 degree X 2 degree quadrangle, Michigan and Wisconsin: U.S. Geological Survey Miscellaneous Investigations Series Map I-1360-B.

Other suggested sources of information:

• Glossary: http://www2.nature.nps.gov/geology/usgsnps/misc/glossaryAtoC.html
• Time scale: http://www.ucmp.berkeley.edu/help/timeform.html
• Michigan Geological Survey: http://www.michigan.gov/deq/0,1607,7-135-3306_28607---,00.html