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I've spent a little time today picking through some very fine micro-matrix from Cookiecutter Creek. This is material that was caught by my 1/20" sifting screen and is so small that I have to use my camera-microscope to see things clearly. I'm searching for some of the rarer micro-fossils that occur in this creek (and actually make Cookiecutter Shark teeth seem common. Just came across what is probably the smallest Cookiecutter Shark (Isistius triangulus) tooth I think I've ever found. It's one of the posterior teeth from the lower right side. Posterior teeth are smaller and the crown starts forming an angle to the root in comparison to the more anterior teeth which are straighter. This is not the most posterior tooth in the row (called a "commissural" tooth) as these are severely angled and have an interesting extension to one side of the root. This tiny treasure measures only about 2 mm in height and narrower in width (the scale in the photo is 0.5 mm). Just thought you'd want to see one of the smaller of the smalls. Not quite at the level of scanning electron microscopy (SEM) but getting in the neighborhood. Cheers. -Ken