Telegraph Creek Formation, also of Late Cretaceous age. The Teton 

 River canyon, presumed to be part of the source area for fluvial 

 and glaciof luvial sediments underlying the fen, is underlain by 

 numerous intercalated thrust fault slices of Mesozoic and Paleozoic 

 rocks, including large areas of Mississippian-aged Madison Group 

 limestone. The surficial sediments of the fen itself are shown to 

 conceal the trace of the easternmost mapped thrust fault. 



Bibliographic source: None - personal communications. 



Author: Nimick, D.A. , R.S. Rasmussun, W.W. Woessner and J. Schmidt 



Title: Geologic and hydrologic investigations at Pine Butte and 

 McDonald Swamps, Teton County, Montana. 



Series: Unpublished report to The Nature Conservancy Montana Field 

 Office. 



Date: 1983 



This report documents a reconnaissance-level investigation of the 

 geologic, hydrologic and geometric controls on the formation and 

 behavior of the Pine Butte and McDonald fens. The deposition of 

 glacial and post-glacial sediments forming the aquifer supporting 

 the fens is described, and hydrologic data including synoptic 

 discharge measurements along the losing reach of the Teton River, 

 potentiometric data from piezometers completed within and beneath 

 the fen sediments, and discharge data for streams draining the fen 

 are provided and discussed. (Streams draining the fen are described 

 as perennial.) Very rough calculations of ground-water flux 

 through the Pine Butte fen system are offered, and some limited 

 qualitative interpretations of bedrock aquifer relationships are 

 provided. (Bedrock is considered to be an unimportant contributor 

 to the hydrologic system of the fen.) 



The basic qualitative interpretation of the study is that ground- 

 water discharge from the underlying unconsolidated aquifer system 

 provides hydrologic support for the fen, and that seepage loss from 

 the Teton River upgradient from the fen provides the largest 

 component of recharge to the unconsolidated aquifer. 



Sands WPA 



Bibliographic source: Geoindex lat-long search 



Author : Hearn , B.C. Jr . 



Title: Geologic and tectonic maps of the Bearpaw Mountains area^ 

 north-central Montana. 



58 



