It was time to search for more areas within the eastern cross timbers, which are blackjack and post oak woodlands dotted with small “pocket” prairies and meadows. Clint and I both want to get to know the woodlands and prairies of north Texas more completely. We both grew up here, but it is surprising how you can get to know some areas so that they become familiar friends while completely missing other places.
In north-central Texas, two belts of oak-dominated woodland extend down from the Red River, ending just above Waco in the east (the eastern cross timbers) and around the Colorado River in the west (the western cross timbers). The eastern cross timbers is skinnier and smaller, and running underneath it is Woodbine sandstone, which makes for reddish sandy soil. The patch of eastern cross timbers that I know best, at Southwest Nature Preserve in Arlington, has outcrops of iron-rich sandstone along with smaller rocks on the surface of the sandy soil. As the years progress, more of these woodlands disappear under the bulldozer in the metroplex and all up and down the I-35 corridor. But looking at a map and the Texas Parks & Wildlife Department website, it seemed that the “Isle du Bois” unit of Ray Roberts Lake State Park would contain a good remnant of eastern cross timbers.
Lake Ray Roberts is a little bit northeast of Denton, and along the eastern shore of the lake there is a knob of park land that juts out into the lake. This is the Isle du Bois unit. We decided to meet there, and circumstances dictated that it would be in the middle of a pretty hot day. I got there about noon and began walking from a spot near the Quail Run campsites.
Early in the walk, an interpretive sign pointed back to an ephemeral pond partly hidden within the trees. I looked around the margins, expecting that I might find a watersnake, and I did see a couple of baby red-eared sliders that probably hatched last year. I always love seeing wetlands, but my goal was further upland. Soon I was seeing open patches of prairie grasses surrounded by oak woodland. I heard from Clint and his family, and they joined me soon afterward.
A good part of our walk was on a “sidewalk” that winds up through the woodlands and glades, but eventually we found a small dirt trail to follow further back into the oak forest. Sure enough, the occasional sandstone broke through the grasses in woodland glades, and much of the soil was red sand. Blackjack oak was everywhere, and it was easy to imagine this being a continuous, unbroken ecosystem extending down to the Southwest Nature Preserve in Arlington.
This walk was a good introduction to a place we want to return to and get to know better.