Ordovician Chandler Ridge Formation

Ordovician Chandler Ridge Formation
State Maine
Name Ordovician Chandler Ridge Formation
Geologic age Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Slate (Zeolitic (prehnite-pumpellyite))W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > Sandstone > Graywacke (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Incidental
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Zeolitic (prehnite-pumpellyite))W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > Siltstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Comments Named for Chase Lake, Piscataquis Co., north-central ME. Consists of a lower member composed of slate and graywacke and an upper member composed of conglomerate and graywacke. Thickness is at least 610 m. Unconformably overlies Chase Brook Formation; conformably underlies Bluffer Pond Formation. (ME017) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith H - Lithic sandstone and conglomerate
Stratigraphic units Meduxnekeag Group
References

Osberg, P.H., Hussey, A.M., and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.

Pavlides, L., 1966, Meduxnekeag Group and Spraugueville Formation of Aroostook County, northeast Maine, in Cohee, G.V., and West, W.S., Changes in stratigraphic nomenclature in the U.S. Geological Survey - 1965: U.S. Geological Survey Bull. 1244-A, p. 52-60.

https://pubs.er.usgs.gov/publication/b1244A

US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.

NGMDB product
Counties Aroostook