WILLIAMSTOWN -- Williamstown Rural Lands Foundation will offer a guided natural history hike of Pine Cobble on Sunday at 1 p.m. to traverse the new section of the Pine Cobble trail and some of the lesser known areas of its Pine Cobble conservation property. Hikers should meet at the Pine Cobble trail head, off North Hoosac Road.

Geoscientist David Dethier will lead the hike. Pine Cobble has a unique geology, and the hike will feature a visit to an area of rock ledges, as well as Bear Spring, traversing two ancient shorelines, one formed by Lake Bascom a mere 14,000 years ago, and the other a tropical shoreline from approximately 500 million years ago, when Williamstown lay closer to the equator.

For more information, call (413) 458-2494, or Visit www.wrlf.org.

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Hoosic River Watershed Association's State of the River Conference will take place in Fellowship Hall of the Williamstown Congregational Church on Saturday from 9:30 a.m. to noon and will focus on PCBs in the Hoosic.

Local and regional news are filled with stories of polychlorinated biphenols (PCBs) present in the sediments and within the aquatic food chain of the Housatonic and Hudson Rivers and the clean ups planned or underway to remove them. PCBs are also present in the Hoosic River.

Williams College chemistry professors David Richardson and Jay Thoman, along with students Amanda Schott and Austin Paul, have analyzed crawfish taken from the Hoosic River and most recently from the Green River and North Branch in Massachusetts. Professors Richardson and Thoman and Mr. Paul will report on their research.

For more information, visit hoorwa.org.