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Manuel Quiring

Beautiful huge ammonite, 17kg. Specimen from masagascar. A natural white fossilized enamel and perfect spiral shape making this fossil even more rare and valuable. Truly a beautiful, wonderfully preserved specimen.
Perisphinctes is an extinct cephalopod mollusc belonging to the ammonites. It lived in the Upper Jurassic (172-149 million years ago), and its fossil remains are found on all continents.
Si tratta di animali di ambiente marino, caratterizzati da una conchiglia esterna composta prevalentemente di carbonato di calcio, sotto forma di aragonite, e in parte di una sostanza organica di natura proteica (conchiolina). La conchiglia era suddivisa internamente da setti in diverse camere, di cui il mollusco occupava solo l'ultima (camera d'abitazione). Le altre, che componevano il fragmocono (parte concamerata della conchiglia), erano utilizzate come "camere d'aria" (analogamente all'attuale Nautilus), riempite di gas e liquido camerale per controllare il galleggiamento dell'organismo. La pressione dei fluidi camerali era controllata da una sottile struttura organica tubolare riccamente vascolarizzata, in parte mineralizzata (il sifone), che attraversava tutti i setti e permetteva lo scambio di fluidi dal sangue e dai tessuti molli dell'animale alle camere tramite un processo di osmosi.

Fossilised shell

Large Ammonite - 24kg - Fossilised shell - Perisphinctid - 41 cm

Fossils

Reserve price

No reserve price

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Closing date

Saturday

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tomorrow

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today

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Location

The Netherlands

Italy

Spain

France

Germany

Lithuania

Hong Kong

Belgium

Taiwan

Sweden

Austria

Greece

Poland

United States

United Kingdom

Ireland

Romania

Bulgaria

Finland

Portugal

Dimensions

Height

Width

Depth

Object

Fossil tooth

Fossilised animal

Amber

Fossil teeth

Fossil skeleton

Raw mineral

Fossilised plant

Fossil bone

Fossil matrix

Fossil fragment

Fossil carapace

Fossil molar

Fossil skull

Fossil mortality plate

Fossil plate matrix

Ring

Fossilised jaw

Fossil vertebra bone

Carved mineral

Metaphysical stones

Necklace

Fossilised wood

Earrings

Fossil cabochon

Country of origin

Morocco

Madagascar

North America

Indonesia

China

Netherlands

Asia

Myanmar

Brazil

Lebanon

Russia

Canada

Algeria

Baltic states

South America

Afghanistan

Australia

Material

Silver

Gold-plated

Gender

Women

Unisex

Condition

Natural

Restored

Enhanced

As new - unused

Reassembled

Good condition

Manipulated

Composed

Excellent condition - barely used with minimal signs of wear

Cast

Reconstructed

Period

Cretaceous (145 - 66 million years)

Neogene, Miocene (23.03 - 5.33 million years)

Cretaceous, Upper (100.5 - 66 million years)

Quaternary, Pleistocene (2.58 - 0.0117 million years)

Neogene (23.03 - 2.58 million years)

Paleogene, Eocene (56 - 33.9 million years)

Cretaceous, Lower (145 - 100.5 million years)

Devonian (419.2 - 358.9 million years)

Triassic (251.9 - 201.3 million years)

Jurassic (201.3 - 145 million years)

Quaternary (2.58 - 0 million years)

Jurassic, Lower (201.3 - 174.1 million years)

Carboniferous, Pennsylvanian (323.2 - 298.9 million years)

Jurassic, Upper (163.5 - 145 million years)

Devonian, Middle (393.3 - 382.7 million years)

Cenozoic (66 - 0 million years)

Jurassic, Middle (174.1 - 163.5 million years)

Triassic, Lower (251.9 - 247.2 million years)

Ordovician (485.4 - 443.8 million years)

Devonian, Lower (419.2 - 393.3 million years)

Carboniferous (358.9 - 298.9 million years)

Neogene, Pliocene (5.33 - 2.58 million years)

Triassic, Middle (247.2 - 237 million years)

Paleogene (66 - 23.03 million years)

Permian (298.9 - 251.9 million years)

Stone

Coral

Blood Coral

Topaz

Pearl

Rhodolite

Turquoise

Lapis lazuli

Carnelian

Natural Pearl

Akoya cultured pearl

Ruby

Sapphire

Amethyst

Zircon

Certification

No laboratory report

Style

Art Deco

Faceted cut

Oval

Cabochon cut

Round

Baroque

Marquise

Exact colour

White

Mineral

Citrine

Mineral form

Freeform

Pearl luster

Good

Pearl surface quality

Lightly spotted

Size on item

Adjustable

55 (EU) / 15 (IT) / 7 ¼ (US)

57 (EU) / 17 (IT) / 8 (US)

56 (EU) / 16 (IT) / 7 ½ (US)

58 (EU) / 18 (IT) / 8 ¼ (US)

After 2000

1900-2000

Before 1400

Treatment

Conserved

Polished

Composite

Original/ Replica

Original/official

Refurbished original

Licensed replica

Reproduction/replica

Specimen

Megalodon

Fossils

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Large Ammonite - 24kg - Fossilised shell - Perisphinctid - 41 cm

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