The field-trip site consists of excellent exposures of Paleozoic strata in roadcuts along I-35 through the Arbuckle Mountains of south-central Oklahoma (Figs. 1 and 2). The exposures extend from 11 to 18 mi (18 to 29 km) north of the city of Ardmore, and are in parts of Murray and Carter Counties. Access to the roadcuts is open at all times, but extreme caution must be exercised because the exposures are along the right-of-way of a major 4-lane divided highway. Parking should be on the far right side of the shoulder, and one should not walk upon or cross the highway. If a large group is to examine the exposures, it would be best to park vehicles in the scenic turnouts and hike along the highway shoulders to examine the roadcuts.