Earth Sciences


Sedgwick showcases a unique geologic history. The Little Pine Fault separates the relatively young eroded sediments and rolling hills of the Paso Robles formation from the sharply uplifted ancient rocks of the Franciscan Formation. This collection of rocks on the northeastern corner of the Reserve is a mélange of 150 million-year-old sea-floor rocks and organisms metamorphosed through the crushing pressure of the earth’s plates. Distinctive green serpentine outcroppings, deep rust-colored chert, and blueshist are beautiful examples of these rocks. The vegetation in this area is also unique, as the mineral composition of serpentine soils presents an inhospitable environment for many plants.

Geologic History of the Transverse Ranges Region, block diagrams and more
Soils Map
Geology Map
Dibblee Map


Station links:
1. In 2011 the Natural Reserve System, in partnership with the Desert Research Institute, installed a weather station on the hill just north of the new administrative building. Real time and archived weather data is available below:

Dendra Weather Data
DRI Data table for graphs
DRI Historical Weather Data
DRI Weather Station Data

2. UCSB Geography Department installed two weather stations in 2007.  Real time and archived weather data is available
Sedgwick Wx Stations

3. Lisque Mesa (“Airstrip” weather station). The Reserve system maintained weather monitoring equipment at the site from 1995 – 2001.
Archived weather data (hourly and daily) is available here.