|Latitude & Longitude (WGS84):||42° 59' 22'' North , 71° 20' 17'' West|
|Latitude & Longitude (decimal):||42.98944,-71.33806|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
Devil's Den is a cave, about 80 feet long. The tremolite locality is reported to be in the vicinity of the cave. Older references place Devil's Den and Mine Hill in the town of Chester. The town of Auburn separated from Chester and was incorporated in 1845.
3 valid minerals.
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 Macrostrat.org
|Devonian - Silurian|
358.9 - 443.8 Ma
|Paleozoic sedimentary and volcanic rocks|
Age: Paleozoic (358.9 - 443.8 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
541 - 1000 Ma
|Massabesic Gneiss Complex|
Age: Neoproterozoic (541 - 1000 Ma)
Description: Quartzose-feldspathic gneiss and biotite schists (locally rusty), granofels, and cal-silicate rocks closely intruded by, and grading into, a pink gneissic granite (623 Ma) that produced a migmatite.
Comments: Part of the Nashoba-Casco-Miramichi Terrane (Merrimack Trough). Map page 2: Massabesic Gneiss Complex: 620-600 U/Pb, orthogneiss(?) per NH039. 646+/-? U/Pb, paragneiss, 475+/-? U/Pb, orthogneiss per NH038. 641+/-25 Rb/Sr, paragneiss(?) per NH040. 375+/-? U/Pb, monazite from aplite dike in Campbell Hill fault at western contact of Massabesic Gneiss per Barbara Barriero, oral commun., 1990. 384+/-2 and 275+/-2 U/Pb, monazite in paragneiss per J.N. Aleinikoff, oral commun., April 1993. 623+/-8 U/Pb ion probe, orthogneiss; earlier age of 475 (NH038) discredited per J.N. Aleinikoff, oral commun., Feb. 1994.
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.