Twin Islands' Bedrock 

Description:The bedrock on Twin Islands dates back half a billion years - older than the Long Island Sound, which washes its shores. Spot a glacial boulder nearby, which was transported here during the Ice Age.

Location: Pelham Bay Park, Bronx
Date: October 4, 2013

• Twin Islands

Pelham  Bedrock  Bronx  Long Island Sound  Pelham Bay Park  Twin Island