NEW YORK (AP) – Crews excavating the World Trade Center site this summer for the foundations of a new skyscraper have uncovered features carved into the bedrock by glaciers about 20,000 years ago, including a 40-foot-deep pothole.

While removing the overlying soil is an engineering necessity, the digging has given scientists a rare window into the deep past and formations like the huge pothole.

The reminders of the power of glaciers won’t be around for long. The pothole and other features are being covered.

“It’s nice to look at, but it’s all got to go,” said Robert B. Reina, a supervising structural engineer at Mueser Rutledge.


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