Guidebook 38: Igneous and Tectonic History
of the Southern Oklahoma Aulacogen

The Survey's newest publication is a 405-page study of some of Oklahoma's most exciting geology!

OGS Guidebook 38, is the latest release in the OGS publication series.  The publication represents a major effort for the OGS and Dr. Neil Suneson, who edited the volume.  This 405-page book measures 1 in. thick and is printed on high-quality paper in a large format that allows ample room for good-sized color photos and illustrations.   The price of the book is $35.

More Information and to order:

National Fossil Day October 15!
National Fossil Day poster


National Fossil Day will be celebrated on October 15. Do you know what Oklahoma's State Fossil is?

It is Saurophaganax maximus, a carnivorous dinosaur of Jurassic age, It was about 40 ft in length from head to tail, weighed about 4,000 pounds, and had long arms and hands with three claws!

Learn more about this giant, and get a dot-to-dot puzzle that you can print and complete.


fossil day

october 15

More information at:

NFD Website


Download an OGS educational publication about fossils and get more dot-to-dot puzzles by clicking here!




Petrified Wood in Oklahoma by Neil Suneson
Available here


Non-Technical Guidebooks to Oklahoma Geology Available for Download

Seven guidebooks suitable for non-technical use are available for free download at Just scroll down on that page and you will see them listed in yellow boxes as Open-File Reports. The guidebooks are part of the Survey's Open-File Report series and are unedited, author-prepared field-trip guides by OGS Geologist Neil Suneson and others.

These guidebooks were compiled for field trips for various groups and have not been made available on this website before now. The reports cover the Broken Bow uplift, southwestern Ozark uplift, Ardmore basin and Lake Murray State Park, Gulf Coastal Plain in Marshall County, Gypsum Hills, Black Mesa, and the Tallgrass Prairie Preserve in Osage County.

The reports contain a lot of useful information and can make for a fun trip to these Oklahoma geology sites. Have fun on a field trip!


Report feeling an earthquake to Oklahoma Geological Survey

Oklahoma Earthquakes