Maybe Very Easy

[cvi huang]

1. if have hole = orthocone cephalopods/ Orthoceras Cephalopoda?

2. bigger have not hole this also accustomed thing but what?

3. more dark with camber maybe pottery lug?

every day lot of circle with half-moon hole, so very common, please teach me what is it, thanks!

Edited September 9, 2012 by cvi huang

[Herb]

1 and 2 look like very worn sea urchins and 3 looks like worn bone.

[cvi huang]

Thank you but more pictures for "circle with hole"

this thing sometimes long

hole is usually one straight with one arc (like moon)

so I think Orthoceras Cephalopoda (?)

Edited September 9, 2012 by cvi huang

[Ludwigia]

I agree with Herb on 1,2&3. Sorry, but I can't identify the last one since it is much too weathered. There is a possibility that it may be a small part of an Orthoceras, if you've found it in the appropriate layers.

[Tarheel59]

The 4 pics for # 3 look like bone from Dugong maybe rib or another bone.. These bones are very dense to allow the animal to stay submerged for long periods of time...Jeff

[Taffie]

other (fish tooth)

Nice photo!

[howard_l]

Do you have any idea what type of rock and what age these came from, that would be very helpful in the identification process.

[cvi huang]

I dont know, it is river gravel (hungarian danube river), but riverbank are clay with eocene/oligocene snails

[cvi huang]

every day same hole, like half-moon.

worm?

[Auspex]

every day same hole, like half-moon.

I am mystified by these. You find many, all similar, but none with any ornament nor details. They have to be something, and I feel like I am just missing an important clue. The material is fine, and homogeneous, like a filled burrow, but I cannot explain the D-shaped hole.

[Herb]

every day same hole, like half-moon.

worm?

Doesn't look organic to me.

[Herb]

Many urchins have apertures on the bottom that are off center and would wear like the ones you have.

[Ramo]

Your second post is a grass carp Pharyngeal, and what looks like a small feline jaw.

[ghost1066]

I am mystified by these. You find many, all similar, but none with any ornament nor details. They have to be something, and I feel like I am just missing an important clue. The material is fine, and homogeneous, like a filled burrow, but I cannot explain the D-shaped hole.

Maybe the clue is at the meeting point of the straight and curved edge of the "D". Each one has a sharp point extending out from it. Could this be from something trilo shaped and the spines along the edge of the shell cut into the mud? Domed back, flat bell, sharp edges burrowing through the mud.

[Herb]

Also, I have seen hundreds of orthocone cephalopods and have never seen any with the type of wear like yours.

[AgrilusHunter]

my old "fossils"

...nawab...

I love the Nymphalidae, and the Polyura caterpillars are the coolest in the whole group. They look like litte dragons.