unindentified fossil(s) with shell and flat flint plate

[anonaddict]

location: aarhus, denmark
found: loose beach rock
units: metric
date: 29/09/2024
image: (1)

notes:  

i've found yet another mysterious black stripe but this one is shiny and also im fairly certain its actually a fossil

 

first off ill include the 3 sides

 

 

Front: (2)

 

right: (3)

 

left: (4)

 

i've also taken various zoomed photos of each side

 

first the shell on the right

 

(5)

 

(6)

 

next the front

 

(7)

 

(8)

 

(9)

 

(10)

 

(11)

 

(12)

 

 

 

left:

 

(13)

 

(14)

 

(15)

 

 

back

 

(16)

 

 

 

(17)

Edited 13 hours ago by anonaddict
numbered images

[val horn]

In the last photo I think that I see molds so a variety of gastropod and bivalves.  So I feel that there are fossils in this rock.  The dark stained areas are not where I see what I think  are the internal molds of shells.  The stain maybe just mineral.  As always going to collect with a club is often very productive in training your eye.

[anonaddict]

3 hours ago, val horn said:

In the last photo I think that I see molds so a variety of gastropod and bivalves.  So I feel that there are fossils in this rock.  The dark stained areas are not where I see what I think  are the internal molds of shells.  The stain maybe just mineral.  As always going to collect with a club is often very productive in training your eye.

so the long stripe is a bivalve? and do you have any idea about the material? it looks kind of like flint based on how its shiny it is and the broken surfaces but ive never seen a flint fossil covered in matrix of a different material like this

[Fossildude19]

Not sure how anything could be ID'd via cross section. 

 

I would give that stone a whack, right in the middle, to see if it shows any better angles of the shells.

[val horn]

I am sorry but I was seeing fossils only in the one side.  

 

 

 

 

[anonaddict]

I'm not super concerned with the exact taxonomic ID for this one, just possibilities based on the visible parts. I am however very interested in how this black line originated because it is very distinct (8). my current assumption is that it is some form of fossil like a piece of shell because thats the only way I can think of for such a uniform layer to form but the material confuses me. This type of limestone doesn't usually have flint layers or inclusions and certainly not any that are this distinct. layers also go through the entire rock, not just a small segment like here and different materials are usually mixed together over 1cm or so and tends to split very erraticly. it splits along random flat surfaces but then randomly have 90 degree angles and i cant predict the location of the surfaces. ill take some pictures with examples once i get home.

Edited 23 minutes ago by anonaddict