Special Edition "What is THAT!!!" Wednesday

Last week Amber and I biked out at the Guana Preserve with Chris Newman and her sister.  This WIIW is a two-parter:

Part 1: Sherd found and left on post near Menorcan well at GTM-NERR.

Part 2: What is that?!?!
No, not that (yellow arrow).
Or that...

...or that...

THAT!!!

It was a privilege to spot both Parts I and II in the field.  First one to guess right gets a snake bit kit! Alright...just a picture of a snake bite kit.