Liquefaction susceptibility in the San Bernardino Valley and vicinity, Southern California; a regional evaluation

10.3133/b1898 ◽  
1991 ◽  
Keyword(s):  
Southern California ◽  
Liquefaction Susceptibility ◽  
San Bernardino

Redescription of the holotype of Bostrichoclerus bicornus Van Dyke, 1938, a rare species of the New World Tillinae Fauna (Coleoptera: Cleridae), with some taxonomic notes

Zootaxa ◽  
2019 ◽  
Vol 4544 (4) ◽  
pp. 548
Author(s):  
ALAN F. BURKE ◽  
JOHN M. JR. LEAVENGOOD ◽  
CLARKE H. SCHOLTZ ◽  
CATHERINE L. SOLE
Keyword(s):  
United States ◽  
Rare Species ◽  
Gulf Of California ◽  
Southern California ◽  
New World ◽  
Original Description ◽  
San Bernardino County ◽  
Southwest United States ◽  
Northwest Mexico ◽  
San Bernardino

Bostrichoclerus bicornus Van Dyke is known from southwest United States and northwest Mexico. To date, only two specimens have been captured: the holotype, collected on Isla Angel de la Guarda, in the Gulf of California, Mexico, and a second individual collected in San Bernardino County, California, United States. The original description of B. bicornus is brief and lacks any images. Considering its rarity, we present the redescription of this species based on the examination of the holotype and compare this taxon to similar genera of New World Tillinae. Images of the holotype and the Bostrichoclerus specimen collected in southern California are given. We conclude that B. bicornus is undoubtedly a member of the subfamily Tillinae with unclear intergeneric relations in the group. 

scholarly journals Smog Nitrogen and the Rapid Acidification of Forest Soil, San Bernardino Mountains, Southern California

2007 ◽  
Vol 7 ◽  
pp. 175-180 ◽  
Author(s):  
Yvonne A. Wood ◽  
Mark Fenn ◽  
Thomas Meixner ◽  
Peter J. Shouse ◽  
Joan Breiner ◽  
...  
Keyword(s):  
Southern California ◽  
Mediterranean Climate ◽  
Rapid Change ◽  
Soil Surface ◽  
Atmospheric Nitrogen ◽  
Wet Season ◽  
San Bernardino Mountains ◽  
San Bernardino ◽  
Fog Deposition ◽  
Very High

We report the rapid acidification of forest soils in the San Bernardino Mountains of southern California. After 30 years, soil to a depth of 25 cm has decreased from a pH (measured in 0.01 M CaCl2) of 4.8 to 3.1. At the 50-cm depth, it has changed from a pH of 4.8 to 4.2. We attribute this rapid change in soil reactivity to very high rates of anthropogenic atmospheric nitrogen (N) added to the soil surface (72 kg ha–1 year–1) from wet, dry, and fog deposition under a Mediterranean climate. Our research suggests that a soil textural discontinuity, related to a buried ancient landsurface, contributes to this rapid acidification by controlling the spatial and temporal movement of precipitation into the landsurface. As a result, the depth to which dissolved anthropogenic N as nitrate (NO3) is leached early in the winter wet season is limited to within the top ~130 cm of soil where it accumulates and increases soil acidity.

scholarly journals Supplemental Material: Latest Quaternary slip rates of the San Bernardino strand of the San Andreas fault, southern California, from Cajon Creek to Badger Canyon

2021 ◽  
Author(s):  
S.F. McGill ◽  
et al.
Keyword(s):  
Southern California ◽  
San Andreas Fault ◽  
Slip Rates ◽  
San Andreas ◽  
San Bernardino

<div>Additional details on methods and for descriptions and interpretations of geologic units at the Badger Canyon site. Additional trench logs and photographs showing locations of dated samples that were not shown in other figures. Tables providing latitude and longitude for all dated samples, as well as field and lab data for terrestrial nuclide dating and complete soil descriptions.<br></div>

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