A beautifully engaging micro-gastropod lens encountered today...



Sometimes we become enthralled by looking at the world with the hope of enjoying the journey, relishing in the goal realized, and have little need to glance sideways.  That is indeed a great occurence but such was not the case today.  I just happened to look behind, to a surface of the rock from where I had passed by, and noticed this marvelous concentration of diverse micro gastropods.  I think there might be Mitrellas, perhaps Nassarius, some Naticas, and that might be an Anadara trilineata bivalve in the middle above.



More Charcharodon photos

Here are a few more shots of the megalodon pictured below...

A couple more sharks from the Miocene (12mya) and Pliocene (2 mya), of Santa Cruz.

I collected these back in the early years of my engagement in paleontology.  Looking at these beautifully-adapted structures it is no wonder that sharks are such a successful line of creatures evolutionarily.



Santa Margarita Fm., perhaps Isurus.

Purisima Fm. Charcharodon, immaculately preserved.

Charcharodon from Santa Cruz, 2 million years ago.

This was one of my more exciting discoveries from years past.

Whale Ears & Storm Chasers

Diane also found the first fossil of the day... a whale's tympanic bulla in a concretion...  A tympanic bulla is a bone found in the skull of cetaceans (whales, dolphins, & porpoises) that is involved in hearing through echolocation.  Because of the extreeme density of the bone (among the densest bones known in the animal kingdom) it preserves as a fossil well.  It has a distinctive "wrinkle" and a thin "lip" of bone.  It is characteristically egg-shaped and one can determine whether it came from the right or left side by cupping the lip between the thumb and index finger with the bulbous part down.  The one below is from the right side of the skull as the lip is on the right.

Nice periotic from yesterday...

Here's a very nice periotic, perhaps from the dolphin Parapontoporia, collected during one of the lowest tides of the year; the added storm created some nice memories... The periotic, like the tympanic bulla, is involved in hearing and echolocation in cetaceans.

Proximal cetacean jaw @capitola 12-4-10

This looks bigger due to the angular cross section...