Well we had a bit of fun with this teaser didn't we? Or perhaps it was just me having the fun? I do hope you enjoyed it too...
I tried so hard to give you clues this week too... not direct clues I'll admit... I still wanted you to think around the topic... 
Finally we have an answer close enough to be the winner. 
As much as I'd have liked the above to be fossilized dino-turds, moth balls, dog biscuits, pea gravel, fungi or, heaven forbid, 1000yr old eggs of gnat found laid within your outer ear canal... it simply isn't so. 
Having told us he'd shot his bolt, Munzly finally cracked it. 
It's a lowly wormcast sitting on moss between two paving slabs.
So Munzly, you win again. What prize will you grasp from this week's Virtual Prize Draw I wonder... and which image can I offer you for your desktop?
Usky's Little Something for the Weekend will be back again next Saturday morning... see you all again then... I hope!
Munzly
I don't think I have never seen any though!
Well, I accept that I was at least "in the right ballpark," but I must admit to thinking it was more of an owl-pellet type of casting than that of a worm.
In a way, since it came out of a back-end rather than a gullet, it is more closely allied to excreta, which almost gives my first guess some merit - can ten-thousand year-old worm casts form coprolites? - who knows!
I do need a new wallpaper, so I'll take a look through your gorgeous photos and let you know.