Corrections for SIM 3361

Gregory J. Walsh

Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire

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First posted online August 16, 2016

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Corrections to map sheet 1:

1. Two structural symbol dip values that were missing were added.

2. Four structural symbols that were missing were added.

3. The garnet-biotite isograd boundary line on the east side of the Littelton Formation (unit DI; 
located at ~43 degrees, 34 minutes North latitude and ~72 degrees, 20 minutes West Longitude) was corrected 
to correspond to the upthrown side of the Ammonoosuc fault zone. 

4. The radiometric age for sample NH-144 (from unit Otp) of 475 plus or minus 5 Ma was corrected to 473 plus 
or minus 5 Ma.

Note that these corrections from the August 16, 2016, map publication were graphic in nature.

No revisions were made on map sheet 2. 

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