Bivalve Fossils
Bivalves appear in the fossil record first in the early Cambrian more than 500 million years ago.   Bivalves as a group have no head and they lack some usual molluscan organs. The shell of a bivalve is composed of calcium carbonate, and consists of two, usually similar, parts called valves. These are joined together along one edge (the hinge line) by a flexible ligament that, usually in conjunction with interlocking "teeth" on each of the valves, forms the hinge. This arrangement allows the shell to be opened and closed without the two halves detaching.

Rastellum "Alien" carinatum bivalves
Rastellum carinatum is a Cockscomb Bivalve from Northern Madagascar and is Cretaceous in age.   Has a typical bivalve zig-zag appearance of where the two valves shut.   Found in Marovoay, Mahajanga district.  Many people call these "Aliens".   Size is typically 70-90mm on average, see the photo for scale 

Rastellum Carinatum 2

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Rastellum Carinatum 6

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Rastellum Carinatum 7

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Rastellum Carinatum 11

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Rastellum Carinatum 14

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Rastellum Carinatum 16

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Rastellum Carinatum 20

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Rastellum Carinatum 1

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Rastellum Carinatum 3

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Rastellum Carinatum 15

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Rastellum Carinatum 16

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Rastellum Carinatum 18

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Rastellum Carinatum 19

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Rastellum Carinatum 9

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Rastellum Carinatum 23

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Rastellum Carinatum 17

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Rastellum Carinatum 24

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Rastellum Carinatum 22

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Rastellum Carinatum 26

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Rastellum Carinatum 28

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Rastellum Carinatum 27

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Rastellum Carinatum 29

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Shell Jasper from Madagascar
Shell Jasper, cut and polished rock slices.  This is full of sea shells, the fossilized remains of bivalves and gastropods. It has really great contrast.   Found in Madagascar.  Makes a great display.

Polished Shell Jasper Slice 1

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Polished Shell Jasper Slice 2

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Polished Shell Jasper Slice 3

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Polished Shell Jasper Slice 4

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Polished Shell Jasper Slice 5

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Polished Shell Jasper Slice 6

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Polished Shell Jasper Slice 7

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Polished Shell Jasper Slice 8

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Polished Shell Jasper Slice 10

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Polished Shell Jasper Slice 11

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Polished Shell Jasper Slice 14

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 Bivalves from Jurassic Madagascar

Polished Bivalve 1

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PolishedBivalve5

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Polished Bivalve 4

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Polished Bivalve 2

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Polished Bivalve 7

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Polished Bivalve 8

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Polished Bivalve 6

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Polished Bivalve 9

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Polished Bivalve 17

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Polished Bivalve 19

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Polished Bivalve 18

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 Gryphaea (Devil's Toenails) from UK
Really the best grade you are going to find of these curious folklore fossils. Gryphaea obliquata was a marine bivalve mollusc.   These all come from Monmouth beach, Lyme Regis. They are dated to around 200 Million years old. Each one is photographed so that you will hopefully be able to see the scale and size.   These are clean and have a natural polished lustre given to them by nature. All we do is give them a little dry brushing and that's it.