Little impact
Despite the crater's size, it seemed to barely touch life on Earth. In the middle of the Late Devonian Period, one of Earth's largest extinctions appears in the fossil record, but the Alamo impact didn't play a role. It occurred about 3 million years too early to have any connection to the mass die-off. And rocks immediately above the crater hold fossils that are very similar to rocks below the impact, suggesting the impact site was quickly repopulated by the area's sponges, snails, fish and primitive corals.
At the time of impact, the Alamo crater was about 120 miles (200 km) west of its current location