It's not often you get to see something around here that's 20,000 years old.

This afternoon, however, you can explore an esker in Butler County, guided by people who know about such things. Webster's defines an esker as a narrow ridge of sand or gravel that is believed to have been deposited by a stream flowing in or under glacial ice.

Because it's been at least 20,000 years since a glacier blanketed Butler County, the esker in the area of the Jennings Environmental Education Center in Brady is believed to have formed during the last ice age, or roughly 20,000 years ago.

Known as the Miller Esker, the serpentine mound of sand and gravel is considered one of the most unusual glacial formations in the area.

Those who want to check it out can meet at the Jennings center to form a car pool, which will leave at 1 p.m. Some areas of the esker are steep and have little shade, so dress accordingly. The tour is scheduled from 1 to 3:30 p.m.

The Jennings Environmental Education Center is at 2951 Prospect Road, or Route 528, just south of the intersection with routes 8 and 173.

For more information, call 724-794-6011 or go to www.dcnr.state.pa.us/stateparks/parks/jennings.aspx.

If the sound of one choir can fill a room, imagine what 11 can do.

You can hear for yourself next Sunday at Choir Fest, where choirs from 11 local churches will perform individually and as a group.

The concert will be held at 7 p.m. at Bakerstown United Methodist Church, 5760 William Flinn Highway, Richland.

It's free, but donations will be accepted for the Lighthouse Foundation, an organization in Butler County that helps those in the community who need housing, work or other resources.

For more information, call 724-898-HOPE or visit thelighthouseonline.net.