Jump to content
Napoleon North

Ichthyosaurus bone piece?

Recommended Posts

Napoleon North

Hi 

 

It is ichthyosaurus bone piece ?

Location: Vistula river area , Pychowice  , Kraków ,Southern Poland

Age: Jurassic?

 

15066177116824385580.jpg

1506617734631676820059.jpg

15066177738561543481919.jpg

Share this post


Link to post
Share on other sites
Fossildude19

I don't think so.  :unsure: 

Share this post


Link to post
Share on other sites
Napoleon North

Next photo.

150661935859962115030.jpg

15066193959871440073008.jpg

1506619428287813885812.jpg

Share this post


Link to post
Share on other sites
jpc

Hard to say if it is bone or not, nevermind what animal it might be from.  I see no bony texture, but then the pix are pretty small.  

Share this post


Link to post
Share on other sites
FossilDAWG

I don't think it has a "bone" texture.  At any rate such a small fragment could not be identified with any confidence, as no diagnostic features are present.

 

Don

Share this post


Link to post
Share on other sites
abyssunder

Maybe fibrous calcite veins with a dark median zone.

 

" Field, petrographic and geochemical analysis of fibrous calcite veins in the Lower Jurassic Shales-with-Beef Member in the Wessex Basin was conducted to investigate the formation mechanism of the veins. Bedding-parallel fibrous calcite veins, including beef veins and tabular cone-in-cone structures, are widespread in the black shales. The calcite veins consist of subvertical fibrous crystals and a dark median zone. The median zone contains scattered clays, pyrite microcrystals, skeletal fragments and amorphous organic matter. The veins exhibit moderate carbon isotope values, ranging from −1.515 to 2.732‰. The oxygen isotope composition ranges from −8.872 to −4.521‰, which is possibly too negative to reflect the primary porewater oxygen isotope signatures and indicates a porewater modification. It is interpreted that the veins mainly derive carbonates from seawater inorganic carbon and bioclasts. The veins formed as closed-system hydraulic fractures in overpressured cells during sediment degassing in the methanogenic zone. The shale beds with a high total organic carbon content could have generated abundant CO2, which may have resulted in either the cementing of the pores in the matrix or overpressure buildup. The skeletal fragments provide a control on the spatial distribution of veins as nuclei for calcite precipitation from supersaturated pore fluids. " - Q. Meng et al. 2017. Early overpressuring in organic-rich shales during burial: Evidence from fibrous calcite veins in the Lower Jurassic Shales-with-Beef Member in the Wessex Basin, UK. Journal of the Geological Society. 174. 869-882

 

1506617734631676820059.jpg.c592af5c231d0a09b3ab8875f1e145eb.jpg.a6fde701e645fd9da53084d7c0be9950.jpgF3.large.thumb.jpg.9d36568e7fa3b525cb16107b413da9cb.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×