Gastropod?

[HeatherMF]

Found this on the same beach as the others, a chunk of cliff had recently fallen away, I assume that's why I found some, and am wondering if there might be more now ... 

[Miocene_Mason]

I agree with gastropod.

[ynot]

Looks like a moon snail steinkern (internal cast).

There should be more where that came from.

To determine the age look at a geologic map of the area and see what it says about Your beach.

[HeatherMF]

Thank you! By your response, I assume the others I found would likely be of a similar age?

[ynot]

If You are finding these on a beach there are recent shells mixed with whatever fossil shells are weathering out of the rock there.

There may be a substantial period of time between the two.

[Coco]

On 19/07/2017 at 8:54 PM, HeatherMF said:

Found this on the same beach as the others

 

Which one other ? Your comments don't remain to follow in the not read subjects, thus we can't know ! Put a link towards the others or restore the information here, thank you

 

Coco

[RJB]

We called those Moonie's up in Northern California.  I cant tell the size of that specimen, but its most likely a kind of Naticid.  Could be Polonicies, but cant tell from the picture.

 

RB

[RyanDye]

On 7/19/2017 at 3:02 PM, ynot said:

Looks like a moon snail steinkern (internal cast).

There should be more where that came from.

To determine the age look at a geologic map of the area and see what it says about Your beach.

There's a German fossil forum called steinkern.de I was wondering what that meant!

[ynot]

4 minutes ago, Ryan Dye said:

There's a German fossil forum called steinkern.de I was wondering what that meant!

Steinkern is a German word meaning "internal cast of a shell". Not sure about the "de" part.

Maybe @Ludwigia or @belemniten can clear it up for Us.

[Kane]

Just now, ynot said:

Steinkern is a German word meaning "internal cast of a shell". Not sure about the "de" part.

Maybe @Ludwigia or @belemniten can clear it up for Us.

The ".de" is just the country extension for the URL. For example "www.cbc.ca" indicates the country where the site is registered is ".ca" (Canada). ".fr" = France, ".pt" = Portugal, etc. 

 

.de, then, is short for Deutschland.

[Ludwigia]

Directly translated, Stein-kern means Stone-core.

[HeatherMF]

All the pictures I've posted have been from the same little stretch of beach in Half Moon Bay, California. Mostly laying on the ground, shell hunting.  Today I went, at low tide, and found them sticking out all over the place. 

[HeatherMF]

Just one example, off Half Moon Bay. I was a little leery of checking out the cliff, as it was crumbling as I watched. Maybe in a few weeks.