Open-File Report 2014–1026
AbstractMarland Billings' classic paper published in 1937 in the Geological Society of America Bulletin established a succession of six stratigraphic units in rocks of low metamorphic grade near Littleton, New Hampshire. The two youngest units are fossiliferous in the area, with ages established at the time as “middle” Silurian and Early Devonian. Billings and students mapped the same stratigraphic section in adjacent areas of progressively higher regional metamorphic grade. This work laid the foundation upon which a major part of subsequent work in New England has been directly or indirectly built. This guidebook was written for a field trip held in March 2013 to visit roadcuts that are as close as possible in March to the type localities or areas of Billings’ six-fold stratigraphic succession. Ten stops are in rocks of chlorite grade of Acadian(?) metamorphism; the final stop visits amphibolite of the Ammonoosuc Volcanics. Fieldwork by the authors over the past 20 years confirms Billings’ broad conclusions. |
First posted April 7, 2014 For additional information, contact: Or Douglas W. Rankin Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader. PDF documents opened from your browser may not display or print as intended. Download the latest version of Adobe Reader, free of charge. |
Rankin, D.W., and Rankin, M.B., 2014, A field trip guidebook to the type localities of Marland Billings’ 1935 Paleozoic bedrock stratigraphy near Littleton, New Hampshire: U.S. Geological Survey Open-File Report 2014–1026, 21 p., https://dx.doi.org/10.3133/ofr20141026.
ISSN 2331–1258 (online)
Introduction
Geologic Setting
Road Log
References Cited