For example, bacteria are responsible for the formation of some minerals such as pyrite, and can concentrate economically important metals such as tin and uranium. Bacteria are also responsible for the chemical composition of the atmosphere, which affects weathering rates of rocks.
Prior to the late Devonian period, there was little plant life beyond lichens, and bryophytes. At this time large vascular plants evolved, growing up to 30 meters (98 ft 5.1 in) in height. These large plants changed the atmosphere, and altered the composition of the soil by increasing the amount of organic carbon. This helped prevent the soil being washed away through erosion.
One of the most famous Biogeologists in the United States was Dr. Preston Cloud, a professor at the University of California, Santa Barbara. Cloud received a research grant from NASA to examine the lunar rocks returned from the Apollo missions.
- Darwin Center for Biogeology (2007). "Darwin Center for Biogeology". Darwin Center for Biogeology. Retrieved September 16, 2007.
- UCSB Geology (2007). "Biogeology research at UCSB". UCSB Geology. Archived from the original on August 10, 2007. Retrieved September 16, 2007.
- Stephanie Tavares (2002). "Moon Rocks at UCSB". University of California, Santa Barbara. Archived from the original on May 24, 2008. Retrieved September 16, 2007.