scholarly journals Geology and mineral evaluation of the Aniakchak River drainage, Alaska Peninsula, for wild and scenic river study

10.14509/124 ◽  
1973 ◽  
Author(s):  
W. M. Lyle ◽  
P. L. Dobey
Keyword(s):  
Alaska Peninsula ◽  
River Drainage

Postglacial Palynology and Archaeology in the Naknek River Drainage Area, Alaska

1963 ◽  
Vol 29 (1) ◽  
pp. 74-81 ◽  
Author(s):  
Calvin J. Heusser
Keyword(s):  
Snow Accumulation ◽  
Drainage Area ◽  
Alaska Peninsula ◽  
River Drainage ◽  
Pollen Diagrams ◽  
Heavy Snow

AbstractSamples were collected from four excavations and three muskegs for palynological examination in connection with a study of human prehistory in the Naknek drainage area, upper Alaska Peninsula. The purpose was to reconstruct the sequence of environments dating back to the earliest recognizable cultural phase, close to 4000 B.P. Pollen diagrams for muskeg show birch and alder as the principal arboreal types. Increasing percentages of alder occur during a late interval of hypsithermal time dating about 5500 B.P. Birch thereafter gained in proportion and between approximately 5000 and 2500 B.P. achieved maxima. Subsequently percentages of birch declined. Pollen spectra disclose that migration of spruce from the interior into this area took place within recent centuries. A climate cooler and drier than at present is interpreted from the diagrams to have been in effect during the earliest cultural phase and probably lasted until about 2500 B.P. Later, climate became slowly warmer and increasingly more humid. Temperature, however, was at first lower than at present and, coupled with greater precipitation, presumably caused heavy snow accumulation in the Aleutian Range which resulted in glacial advances during recent centuries.

First record of the crystal darter (Crystallaria asprella) from Big River, Missouri, since 1963

2010 ◽  
Vol 44-45 (2010-2011) ◽  
pp. 41-43
Author(s):  
Jeffery M. Ray
Keyword(s):  
Endangered Species ◽  
First Record ◽  
Main Stem ◽  
Jefferson County ◽  
River Drainage

Abstract The capture of a crystal darter Crystallaria asprella, a state endangered species in Missouri, from the main stem of Big River (Meramec River drainage) in August 2009 represented the first documentation of the species in nearly 50 years from Big River, Jefferson County, and only the second record ever reported from this river.

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