Re: using tarp under tent in winter necessary?

Just got back from a weekend in the Black River Forest in Wisconsin, and a tarp was definately a help. We were diggind out from mid-thigh a hex for my tent. MY snow stakes were useless, being 8", and this meant using study sticks for stakes, supplied by the downed tress in the area. Anyways, I leaned after the first day, when we broke camp, there was a huge, gnarly root right under where we were sleeping, and I'm sure the Eureka Tent-Saver I cut up did its job just fine. I'd hate to imagine my tent's floor left to fend itelf against all the crap you find buried in the snow.