I can’t tell you much about the Selma Pathfinders except their website hasn’t been updated since 2010. http://www.selmapathfinders.com/
They do have an event coming up on March 31st down at Lost Maples State Park near Vanderpool, TX.
The walk will be along the west trail. It will include hiking through some dry creekbeds with rocks, and a climb up a moderate incline hill. Decending the hill, the trail flattens and goes along a canyon before returning to the park road. A 5 Km relatively flat and rock free trail will go out to a pond and return, rated 2B.
Flyer is online now at: http://www.ava.org/gen3/data/event_details.asp?eventid=92349
I walked an event there in 2002. Here are my pictures, not sure if it is the same trail but it give you and idea of what you might see.