Creek Crawling

I had some time before work the other day, so I hit up a creek known for its larger teeth.  I went with a friend of mine and we both got some nice teeth.  Only being there about 2 hours, the knees were killing me!!  We were both on hands and knees crawling around looking for Ptychodus!  Its kind of a toss up on what is harder on the back?  Sifting for 2 hours or Crawling??  I did pretty well, I found 6 good sized Ptychodus teeth, a few bladed teeth, and a nice fish very!

Justin