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Asphalt Chips - Ordovician Dolomitic Limestone

ASPHALT CHIPS is sourced from Ordovician Dolomitic Limestone and manufactured to customer specified physical properties and sizes.  It contains minimal fines and deleterious material. Pattison’s quarries yield an exceptional quality extremely hard material that helps to extend the life expectancy of roads. It has superior friction factor, reduces cracks, freeze/thaw impacts, and lowers maintenance costs.

Asphalt Chips

ASPHALT CHIPS can be washed or dry screened. It  is also known as asphalt stone, asphalt aggregate, asphalt chips (1/4″, 3/8″, 5/8″, 3/4″), asphalt rock, and type A asphalt material. Pattison produces this incredibly hard stone from superior quality Ordovician Dolomitic Limestone ledges with our state-of-the-art, jaw/cone crushing plant. Our plant features compression crushing technology that reduces fines generation and increases fractured faces.

Asphalt Chips Certifications

Pattison’s ASPHALT CHIPS is certified for use in Department of Transportation interstate and highways, asphaltic concrete, blacktop, hot mix asphalt roads, chip overlays, ultra thin overlays, and chip seal roads. 

Exceptional Quality Source Material

This material is produced to specific physical property specifications. Pattison’s quarries feature a variety of Ordovician Dolomitic Limestone ledges that yield materials that meet our customer’s individual requirements. ASPHALT CHIPS is sourced from durable ledges that have minimal deleterious material inclusion. This material outperforms materials from non-Ordovician quarries on freeze thaw, abrasion, specific gravity and absorption tests. It’s low absorption properties make it the ideal asphalt aggregate as it reduces the mount of petroleum oil required.  See what wikipedia has to say.

Asphalt Chips Production

Pattison ASPHALT CHIPS is of exceptional quality, and is approved by the Departments of Transportation in Iowa, Missouri, and Minnesota. It is the optimal choice aggregate for asphalt material projects. 

With our direct to rail transfer system, Pattison products move quickly from production to rail loading. This reduces reduces product degradation and handling costs.

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.

Asphalt Aggregate Certifications

CertificationsSizesTech SizeMaterial Type
Type A (chips)
Type A (fine mix)

3/8" chips
fine slurry mix

1/4" minus
3/8” x #50

Dolomitic Limestone
Gradation A
Gradation B
Gradation C
Gradation D

1/2" minus
1/4" minus
1" minus
3/8" minus
5/8" x #4
1 1/2" x #4

5/8" x #4
1 1/2" #4
Dolomitic Limestone
MODOT Chip Seal Agg.
Grade A1
Grade A2
Grade B1
Grade B2
Grade C
Bituminous Surface

1/2" x #4
1/4" x #8
1/2 x #4
1/4 x #8
1/2" x #4
3/4" x #8

1/2" x #4
1/4" x #8
1/2" x #4
1/4" x #8
1/2" x #4
3/4" x #8
Dolomitic Limestone

Asphalt Aggregate Properties

Absorption1 to 2.25%
Abrasion26% to 31%
Insoluble Residue1.53% to 4.29%
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 ASPHALT CHIPS.

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 ASPHALT CHIPS 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