Current Research

With Libby Gans, I wrote Roadside Geology of Southern California, published by Mountain Press Publishing Company, Missoula, Montana, January 2016. 

  I study the tectonic and petrologic evolution of late Tertiary volcanic rocks in the northern Lake Tahoe - Donner Pass region of the northern Sierra Nevada. My goal together with Professor William Wise is to understand the structural and tectonic setting of the volcanism (why do volcanoes erupt where they do?), and how the Basin and Range structures are extending into and modifying the northern Sierra Nevada. Together with Jordan Hastings and Lorre Moyer, I digitized 136 student field maps in six 7.5' quadrangle northwest of Lake Tahoe using ArcMap 9.2. The map was published in 2012 by the California Geological Survey as MS-60 at a scale of 1:48,000. A digital version is here: http://www.quake.ca.gov/gmaps/MS/ms_60/tahoe_donner.html

Together with Gary Raines, Jordan Hastings, Chris Henry, and a gang of summer field camp students, I have compiled and published a geologic map of the Sagehen Creek and Independence Lake hydrologic basins about 10 km north of Truckee, California. This project is an extension of the mapping mentioned above and comprises about 55 km2 in the Independence Lake and Hobart Mills 7.5' quadrangles. The map was published by the California Geological Survey as Map Sheet 63 in 2017.

I maintain low level monitoring of erosion and retreat of the UCSB beach cliffs.

I am compiling digital geologic maps of the San Andreas fault in the Mecca Hills, and of the geologic structure of the Catena Costiera in Calabria, southern Italy, between Paola and Amantea.

Click here to see a power point about Vrådal K-feldspars

 

Recent Publications

Sylvester, A.G., 2011. The nature and polygenetic origin of orbicular granodiorite in the Lower Castle Creek pluton, northern Sierra Nevada batholith, California. Geosphere 7 (5), p. 1–9; doi:10.1130/GES00664.1.

Sylvester, A.G., W. S. Wise, J. Hastings, and L. Moyer, 2012. Geology of the North Lake Tahoe - Donner Pass region, northern Sierra Nevada, California. California Geological Survey Map Sheet 60, scale 1:48,000. A digital version is here: http://www.quake.ca.gov/gmaps/MS/ms_60/tahoe_donner.html

Sylvester, A.G., and E.O. Gans, 2016. Roadside Geology of Southern California. Mountain Press Publishing Company, Missoula, MT. ISBN 9780878426539

Sylvester, A.G., and Gary Raines, 2017. Geology of the Independence Lake and Hobart Mills 7.5' Quadrangles, Nevada and Sierra Counties, California. California Geological Survey Map Sheet 63, scale 1:24,000.

 

Recent Abstracts

Kimbrough, A.J., A.G. Wood, Ky le Moulton, G. L. Raines, D.N. Livesey, and A. G. Sylvester, 2013. Geomorphology and geologic history of Sagehen Valley, Truckee, California. GSA Abstracts with Programs 45 (7), 803.

Bergh, S., A.G. Sylvester, A. Damte, and K. Indrevær, 2014. Evolving transpressional strain fields along the San Andreas fault in southern California: Implications for fault branching, fault dip segmentation and strain partitioning. European Geophysical Union General Assembly, 2014-2966.

Sylvester, A.G., and G.L. Raines, 2014. New geologic map of the Independence Lake and Hobart Mills 7.5' quadrangles, Truckee area, northern Sierra Nevada, California. Rocky Mountain and Cordilleran Sections Joint Meeting, Geological Society of America Abstracts with Programs 46 (5), 90.

Sylvester, A. G., 2016. Sea cliff retreat: Campus and Isla Vista Beaches, Santa Barbara, California, Geological Society of America Abstracts with Programs 48 (4).