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Building Trust With
Quality Aggregate Products

Why Select Geo Aggregates?
  • Competitive pricing along with dedicated employees who are committed to quality products and superior customer service make us the North Coast leader in supplying a full spectrum of washed and unwashed aggregate materials, sand and soils.
  • We custom crush our products in our own quarries according to Caltrans and ASTM guidelines, allowing us to create special products to meet your specifications.
  • Open to the public, our 10 Mile Quarry Wash Plant serves government agencies, businesses, contractors, landscapers, and other customers who need aggregates, sand, and soil products. Come pick it up in your 5 cubic yard or larger truck, or have us deliver direct to your site.
  • We offer truck transportation and specialty products to help complete your project.

Dennis Kirwan was born in Fort Bragg, CA, and started his own tractor business at the age of thirteen.  He earned his pilot’s license in high school and flew jets and helicopters as a corporate pilot for 15 years.  After graduating with a Business degree from Sonoma State University in 1989, he and his wife, Beth, started Geo Dynamics in Santa Rosa, CA, specializing in vineyard and winery site planning, construction engineering and land development. Learn more

  • Custom Crushed Rock Orders
  • Asphalt and Paving Services
  • Truck Transportation
  • Project Planning    ________________________
   Office Hours:
Mon-Fri 7:00 AM – 5 PM
Call Us Today for a Quote

(707) 964-4033


NEW - Landscape Products are now available!

  • Washed Materials
  • Concrete Sand
  • Class I and Class II Base Rock
  • Bank Run Fill Material
  • Rip Rap/Boulders
  • Cobble
  • Beach Sand
  • Planting Mixes and Soil
  • Recycled Materials
  • Asphalt Paving Material
Click here for product list


Open to Commercially Insured Vehicles

For Truck Size 5 Cubic Yards or More

Monday – Friday
7:30 AM – 4:30 PM

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