Final answer:
The town by which the Eagle Ford Shale outcrops is Eagle Ford itself. This geological formation near Sierra Madre Oriental is known for its energy resources.
Step-by-step explanation:
The Eagle Ford Shale outcrops by the town of Eagle Ford. This is indicated in the reference stating that a reverse fault in the Eagle Ford outcrop is present west of Del Rio, Texas. The area is marked by geological activity from the Laramide-era contraction, which is closely associated with the Sierra Madre Oriental. Eagle Ford Shale is a significant geological formation known for its rich deposits of oil and natural gas, making it an important site for energy production.