nice handful you got there. Can't beat finding them at work either. My only problem would be I wouldn't get anything done{^;^}. I like those yellow one's, that top one is just Sweet! nice stuff man.
Thanks folks- Rock I would say the first one would likely be a Kirk.
ptsofnc- Maybe a little transitional something to it but I would call it a Palmer
DigIron- I believe it is rhyolite with heavy patina or might be some type solidified shell material