With my daughter Kathy, only 25 species in about 2.5 hours, but some were 
notable:

West of Earl's Picnic Ground, near where the trail fords LB Crk, a Kentucky 
Warbler and a male Blue Grosbeak

On the ground at Earl's, what seemed to be a Rusty Blackbird (foraging near 
a Wood Thrush).  The blackbird seemed to be a female in plumage intermediate 
between alternate and basic.  This is a species I seldom see, so I'm a bit 
uncertain about the ID.  How likely is this?  The books indicate that it 
doesn't nest here, but could it be migrating now?

A Barred Owl, near the tiny creek you cross shortly before reaching Earl's

All of the above are lifers for Kathy, who didn't start birding until after 
she moved to Seattle.

    Bob Hartman
    Colesville, MD