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This doesn't seem to be the case. The authors are calling this the result of “Aeolian” forces (i.e the wind). They're claiming the wind blew dirt and debris into the cave where the extremely dry conditions preserved it.

Sortof windy in the cave, eh??? I don't find the part you mentioned, is there another article somewhere I haven't seen???

Anyway, it would seem to me the simpler the explanation, the better. I mean, since they're grasping for an explanation and all -- Occam's Razor and such. Someone else mentioned a rock fall/collapse that may have covered the turd in question. A side note, the area in and around Oregon is not exactly a desert, at least the present climate, so the "extremely dry" part doesn't seem to fit. I dunno; the whole thing smells.

I downloaded the journal article from Sciencexpress. I'm assuming that there are consistent characteristics that leads them to this conclusion. That is usually the source of these explanations.

Oregon seems very dry to me but I live in Pennsylvania which is much much wetter than even the coast of Oregon. The caves they investigated are definitely in a dryer part of Oregon, a little over 100 miles from the Nevada/California border. One article (from the U of O) does call them “desert” caves.