Volcanic Tuff in Fresno County California

Fresno County, officially the County of Fresno, is a county located in the central portion of the U.S. state of California. As of the 2020 Census, the population was 1,008,654. The county seat is Fresno, the fifth-most populous city in California.
  • Country: United States
  • State: California
  • Region: San Joaquin Valley
  • Metro area: Fresno–Madera
  • Incorporated: 1856
  • Named for: The city of Fresno (Spanish for "ash tree")
  • County seat: Fresno
Data from: en.wikipedia.org