A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Tonalite (quartz diorite), San Diego County, California, USA |
|---|---|
| Description | This medium-grained intrusive igneous rock is dominated by quartz, biotite, and light gray plagioclase. This sample is about 10 cm. |
| Chronostratigraphy | Upper Cretaceous |
| Geologic province | Bonsall Tonalite |
| Location | USA ▹ California ▹ San Diego. Near San Diego. |
| Photographer | Joseph Hartman. 2001-02-08. |
| Collection | Ward’s Collection of Classic North American Rocks #24. |
| Key words | Bonsall, tonalite, quartz diorite, California |
| Tech details | 801 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 34 |
 | |