Found near Castaic Formation

[Kneesamo]

Found this near the Castaic Formation in Santa Clarita California. The Castaic Formation is known for it's marine fossils but this looks like a bone from a land based animal. 

 

20190512_080859 by Benjamin Scott Cook, on Flickr

 

20190512_080908 by Benjamin Scott Cook, on Flickr

 

 

[Auspex]

Despite its suggestively bone-like shape, the cross section shows neither cancellous nor cortical bone textures.

I suspect that it is a concretionary nodule, of geologic origin. These are a sometimes common feature in sedimentary rocks.

 

[Auspex]

It could also have originated as a seabed burrow...

[caldigger]

Our marine deposits tend to be filled with shrimp burrows.

[Kneesamo]

On 5/12/2019 at 9:16 AM, Auspex said:

It could also have originated as a seabed burrow...

 

On 5/12/2019 at 10:07 AM, caldigger said:

Our marine deposits tend to be filled with shrimp burrows.

 Thank you for your responses. 

 

So what looks like could've been an area formerly filled with marrow in part of a burrow?

[Auspex]

11 hours ago, Kneesamo said:

 

So what looks like could've been an area formerly filled with marrow in part of a burrow?

Possibly iron, accreted by bacteria as a metabolite. This is one of the basic processes by which concretions form.