Eerie Limestone Formation IMG_0070
The shadows on the obvious "eyes" of the limestone looked so eerie!
"On top of the Austin Chalk are several different layers of beds known as the Taylor formation. Deposition of the Taylor beds marks the point of eustatic regression which continued until the end of the Cretaceous period. Ozan Marl is the first bed overlying the Austin chalk and can be found underneath the city of Richardson and Garland. The Ozan Marl consists of calcareous micaceous clay with increasing silt and sand towards the top. The environment that hosted the deposition of the Ozan marl was still in a relatively deep marine and low energy environment, but began to see sedimentation dominated by mud since the sea level was falling. The Ozan marl is around 500 ft thick, and marine megafossils can be found. On top of the Ozan marl is two thin beds known as the Wolfe City Sandstone and Pecan Gap Chalk. The Wolfe City Sandstone is known in the city of Rockwall, Texas for its sandstone dikes that protrude into the surface, and gives a surface expression of a wall built of rocks. The very top of the Taylor has a 300-foot section of marls known as the Marlbrook Marl." -- Geology of the Dallas–Fort Worth Metroplex, Wikipedia
Eerie Limestone Formation IMG_0070
The shadows on the obvious "eyes" of the limestone looked so eerie!
"On top of the Austin Chalk are several different layers of beds known as the Taylor formation. Deposition of the Taylor beds marks the point of eustatic regression which continued until the end of the Cretaceous period. Ozan Marl is the first bed overlying the Austin chalk and can be found underneath the city of Richardson and Garland. The Ozan Marl consists of calcareous micaceous clay with increasing silt and sand towards the top. The environment that hosted the deposition of the Ozan marl was still in a relatively deep marine and low energy environment, but began to see sedimentation dominated by mud since the sea level was falling. The Ozan marl is around 500 ft thick, and marine megafossils can be found. On top of the Ozan marl is two thin beds known as the Wolfe City Sandstone and Pecan Gap Chalk. The Wolfe City Sandstone is known in the city of Rockwall, Texas for its sandstone dikes that protrude into the surface, and gives a surface expression of a wall built of rocks. The very top of the Taylor has a 300-foot section of marls known as the Marlbrook Marl." -- Geology of the Dallas–Fort Worth Metroplex, Wikipedia