Secret Places: North Sulphur River
From mosasaur vertebrae (and teeth!) to mammoth bones, the fossil fauna to be found in this remote corner of NE TX are truly remarkable.
The confluence of ancient sea-going reptiles and not-so-ancient land mammals results from the unique geology of the region, which finds late Cretaceous shales overlain unconformably by Pleistocene sediments.
As sometimes happens in the course of life, our interests and avid pursuits change. Thus, Anne and I had not visited the Sulphur (or, in fact, gone fossil hunting at all) in many years. So it was a pleasure to find the place not even remotely changed from our last expedition.
The nature of the North Texas prairie landscape is such that roadcuts and creekbeds are the only places where underlying rock stata are exposed. (You can actually add building excavations and quarries to this list, which is why fossil hunters keep a rabid eye out for access to such sites — both legally granted and shadily snuck upon.) Coincidentally, the beds of watercourses are also the only places offering any appreciable vertical terrain. For those of us who pine for the mountains and canyons of points farther west, a scramble down into such a defile makes for a pleasant reminder of what boots are for.
The location pictured is just north of the little town of Ladonia, about a mile or two out a farm to market road. To access you just pull your vehicle over into the grass (there are no shoulders) and seek out the most likely way down.
One should not expect to find exotic reptile fossils on a casual late-afternoon jaunt, and in fact we did not. Anne picked up a nice cretaceous clam (Exogyra ponderosa), and I couldn’t resist pocketing a few of the nicer ebony-black baculites sections I ran across. A couple of unidentifiable well-worn pieces of bone showed up, but — trust me on this — we have enough of that kind of material in boxes and coffee cans stored away in the toolshed for us to with for any more.
Anne claims to have found a shark tooth, but I have yet to see it. (Her backpack is still in the Jeep, and it’s raining outside this morning.)