Magnificent Discovery
The discovery of the crater made Penfield want to dig deeper. That was why he commissioned a gravity map from his employer in the 1960s. During this time, he discovered something rare about the map and his magnetic survey. When he put them together, he discovered that the two arcs made a circle.
That was how he knew he had discovered something magnificent. He found a vital part of history. He discovered the day the comet created the big bang and the life we know today.