Carmel Church Day 3

Usually by the third day of an excavation things have started to settle into a routine. For this excavation, routine means big rocks, and we found several more today.

Here’s a marked-up version of the image at the top, with rocks outlined in red and bones in blue:


The big rock in the middle is the original one we discovered in 2013, while the others were all found today. There are several interesting things of note here, besides the fact that so many big rocks are present. It appears that the rocks in the upper left corner may have originally been one rock that was shattered before or during Calvert deposition (there was Calvert sediment between the pieces), although we haven’t actually fitted them back together yet.

Also notice how the bones are distributed relative to the rocks. While we’re finding some bones on top of the rocks, most of them are wedged into the gaps between the rocks. So far we haven’t found any bones under the really huge rocks (although we have found bones under small and medium size rocks). That tells us a few things. The giant rocks were probably already sitting on the sea floor when the bonebed formed, although we can’t yet say how long before. But while the rocks were there, they were sticking up above the bottom, leaving gaps to be filled by Calvert sediment (and bones).

For all my talk about the rocks, we did find several interesting fossils today. Chip found a couple of unrelated vertebrae next to each other. One is a moderately large apparent mysticete vertebra that’s still in the ground:


The other is a tiny and rather unusual thoracic vertebra, apparently from an odontocete:


Fortunately all the thunderstorms missed us today, so hopefully we’ll be just as lucky tomorrow.

This entry was posted in Carmel Church Geology, Carmel Church Quarry, Chesapeake Group. Bookmark the permalink.

4 Responses to Carmel Church Day 3

  1. Actually I was waiting for the interpretation of how the bones got between the rocks. Since the rocks were on the seafloor first, the whales died, fell to the seafloor and as the flesh rotted away, the bones came to nestle between the rocks, correct? Any thoughts regarding how the whales died or if there any signs on the bones of predation? Cool stuff.

  2. altondooley says:

    Basically, I don’t know. There are lots of unresolved issues with how the Carmel Church bonebed formed.

  3. Boesse says:

    Hey Butch,

    You reminded me that I’ve seen a similar bonebed in the Santa Margarita Sandstone (=former Drakes Bay Formation) at Point Reyes where there are Dusisiren vertebrae and ribs stuck in between boulders eroded from the Point Reyes Conglomerate and deposited within the basal glauconitic unconformity of the Santa Margarita Ss. In some cases, bones looked like they had been deformed pretty badly, with some ribs wrapped around boulders – I always wondered if it was penecontemporaneous, but it’s more likely in that case that bones and soft matrix were compacted differently relative to the extremely indurated reworked clasts/boulders.

  4. Its a mystery for now!

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s