Boulder Creek (IMAGE) University of California - Santa Cruz Caption Geologist Noah Finnegan in Boulder Creek in California's Santa Cruz Mountains. Rivers in steep landscapes like the Santa Cruz Mountains transport lots of sediment and do not conform to 'threshold channel' assumptions that apply to gravel-bedded rivers in other parts of the country. Credit Allison Pfeiffer Usage Restrictions For use only with news coverage of this research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.