scholarly journals Conglomerates of the upper middle Eocene to lower Miocene Sespe Formation along the Santa Ynez Fault; implications for the geologic history of the eastern Santa Maria Basin area, California. Reconnaissance bulk-rock and clay mineralogies of argillaceous Great Valley an Franciscan strata, Santa Maria Basin Province, California

1995 ◽  
Keyword(s):  
Middle Eocene ◽  
Bulk Rock ◽  
Geologic History ◽  
Lower Miocene ◽  
Santa Maria Basin ◽  
History Of ◽  
Great Valley ◽  
Santa Maria ◽  
Basin Area

Coleopterous egg deposition on alder leaves from the Klondike Mountain Formation (Middle Eocene), northeastern Washington

1991 ◽  
Vol 65 (2) ◽  
pp. 334-335 ◽  
Author(s):  
Standley E. Lewis ◽  
Mark A. Carroll
Keyword(s):  
North America ◽  
Middle Eocene ◽  
Flea Beetle ◽  
Fossil Plants ◽  
Geologic History ◽  
University Of Washington ◽  
Egg Deposition ◽  
History Of ◽  
The Republic

Flea beetle (Chrysomelidae) egg deposition has been found on three impressions of alder (Alnus parvifolia) leaves collected at a roadcut in Republic, Washington. These fossils were discovered by Wes Wehr (University of Washington, Burke Museum) during investigations of fossil plants from the Republic, Washington, area. These impressions represent a yet to be determined species, belonging to the genus Altica GeofFroy (1762). They represent the first member of this genus to be described from the Eocene of North America. The fossils were found in lacustrine rocks from the lower part of the Klondike Mountain Formation. Figure 1 represents the Republic fossil locality and the distribution of this Formation. A brief description of the geologic history of this region can be found in Wolfe and Wehr (1987). The Klondike Mountain Formation has a radiometric age that ranges from 42.3 ± 2.0 to 50.3 ± 1.7 m.y. (Pearson and Obradovich, 1977).

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