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Clean Rock - Ordovician Dolomitic Limestone

Pattison CLEAN ROCK is produced using a variety of Ordovician limestone types located throughout the Pattison Quarry. Because of the number of uses for this material, it is manufactured to a variety of sizes and desired physical properties. CLEAN ROCK is dry screened and does not contain fines increasing aggregate permeability. This results in an excellent bedding material that reduces absorption and resists freeze/thaw degradation.

Clean Rock – Ordovician Dolomitic Limestone

CLEAN ROCK is also known as  pipe bedding, clean rock, porous backfill, porous fill, chips, bedding stone, drain rock, underlayment, base material, pothole repair stone, and clean chips. Pattison produces CLEAN ROCK products in our state-of-the-art, jaw/cone crushing plant. Our crushing plant is built around a sophisticated compression crushing technology that reduces fines generation and increase fractured faces. 

Where is Clean Rock Used

Pattison CLEAN ROCK is used as an underlayment, pipe bedding, and road base. It is used in drainage fields, walkways, construction projects, and landscaping. CLEAN ROCK is loaded for shipping with our direct to rail transfer system. As a result, products move quickly from production to rail with minimal handling, dramatically reducing product degradation and loading costs.

Clean Rock Production

This material is commonly ordered in specific sizes and physical properties. Because of this, we harvest material from a variety of Ordovician Dolomitic Limestone ledges within our quarry to meet specific requirements. Pattison’s stone products are sourced from a variety of very high quality ledges, each with specific properties. Limestone extracted from these ledges contains minimal deleterious material, and performs exceedingly well on multiple quality assurance tests.

Pattison CLEAN ROCK meets the quality usage designations in the states of Iowa, Missouri and Minnesota. Here’s what Wikipedia has to say.

More about Ordovician Dolomitic Limestone

When it comes to rock, age really matters.  Ordovician Dolomitic Limestone is some of the highest quality, hardest and most durable anywhere in Iowa. Ordovocian formations are only found in the northeast portion of Iowa. Pattison’s Clayton, IA quarry site is right in the middle of it.

Clean Stone Certifications

CertificationsSizesTech SizeMaterial Type
Iowa DOT (Non-Interstate)1"1" x 3/8"Dolomitic Limestone
Iowa DOT (Interstate)1"1" x #4Dolomitic Limestone
Missouri DOT1"1" x #4Dolomitic Limestone

Clean Stone Properties

Abrasion31% to 47%
"C" Freeze1 to 3
Del. materials0% to .6%
Disclosure: The information presented above is to the best of our knowledge accurate based on testing by certified independent laboratories. Any recommendations or suggestions are made without guarantee since conditions and/or material handling are out of our control. Pattison warrants that purchased product will meet the specifications set forth by the buyer.

State of the art Aggregate Plant

Pattison’s newly installed Cone Crusher and production plant is state-of-the-art, producing some of the highest quality Ordovician Dolomitic Limestone CLEAN ROCK.

Material is separated into various required sizes without inducing fractures, while yielding a refined individual rack shape that is the most desirable for tight compaction and stability. Pattison’s new aggregate plant produces CLEAN ROCK of exceptional quality.

Pattison Roadrock Plant

Logistics second to none

Pattison recently completed its Rail Spur project, extending multiple rail lines directly into our new state-of-the-art aggregate production plant!.

Pattison’s advanced direct to rail loadout system coupled with the Pattison rail spur allows aggregate products to be loaded directly from the production plant on to enclosed rail ore cars for delivery. Eliminating excess handling saves costs, and insures a higher quality product.

Pattison Direct to rail load out

Pattison High Quality Aggregates and Proppants

Pattison produces high quality ordovician dolomitic limestone Aggregates and silica proppants.  Our Clayton IA, quarry contains multiple limestone ledges yielding material with a variety of properties that meet various requirements.  Our products are certified for use by multiple state Departments of Transportation, and the FAA.

Revetment Stone

Asphalt Stone

Ballast Stone

Concrete Stone

Clean Stone

Fine Aggregate



Specialty Products

Contact our Aggregate Sales Team for more information!

Contact our Aggregate Team Now!

Our quarry is located in Clayton, IA. We are one of the only sources of Aggregates and Proppants that can load directly to Rail, Truck or Barge from the same facility! Our logistic & delivery systems out pace our competitors. We’d love to hear from you!

Contact information

Aggregate Team

:  (563) 964-0106

: AggInfo@pattisonsand.com

Main Office

701 1st Street
Clayton, IA 52049

: (563) 964-2860

: info@pattisonsand.com

Operations Office

24312 Mississippi Rd., Clayton, IA 52049

Hours of operation

Office Open Monday – Friday: 8am to 4pm
Operating Hours – 24/7