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Manuel Quiring

Beautiful huge ammonite, 17.2kg. 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.

Jurassic (201.3 - 145 million years) - Madagascar

Large Ammonite - Fossilised shell - Perisphinctid

Fossils

Reserve price

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Closing date

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Location

Italy

The Netherlands

France

Spain

Germany

Hong Kong

Lithuania

Poland

Taiwan

Belgium

Romania

United States

United Kingdom

Austria

Portugal

Türkiye

Denmark

Ireland

Size

S (10–40 cm)

XS (under 10 cm)

M (40–80 cm)

L (over 80 cm)

Dimensions

Height

Width

Depth

Object

Fossil tooth

Fossilised animal

Amber

Fossil skull

Fossil skeleton

Fossilised shell

Fossil matrix

Raw mineral

Fossil fragment

Taxidermy replica mount

Fossilised plant

Fossil plate matrix

Fossil teeth

Fossilised jaw

Fossil bone

Carved mineral

Fossilised wood

Fossil vertebra bone

Fossilised claw

Ring

Fossilised tusk

Fossil cabochon

Fossil carapace

Fossil mortality plate

Metaphysical stones

Country of origin

Morocco

Madagascar

Indonesia

North America

China

Netherlands

Asia

Lebanon

Myanmar

Brazil

Russia

U.S.

Africa

Canada

Baltic states

Algeria

Chile

India

Mexico

Material

Silver

Gold-plated

Gender

Women

Unisex

Condition

Natural

Restored

Composed

Enhanced

Good condition

Cast

Reconstructed

As new - unused

Manipulated

Good condition - used with small signs of aging & blemishes

Good

Fair condition

Extras

in sealed box

Period

Cretaceous (145 - 66 million years)

Neogene, Miocene (23.03 - 5.33 million years)

Cretaceous, Upper (100.5 - 66 million years)

Devonian (419.2 - 358.9 million years)

Neogene (23.03 - 2.58 million years)

Cretaceous, Lower (145 - 100.5 million years)

Paleogene, Eocene (56 - 33.9 million years)

Quaternary, Pleistocene (2.58 - 0.0117 million years)

Triassic (251.9 - 201.3 million years)

Jurassic (201.3 - 145 million years)

Jurassic, Upper (163.5 - 145 million years)

Jurassic, Lower (201.3 - 174.1 million years)

Quaternary (2.58 - 0 million years)

Ordovician (485.4 - 443.8 million years)

Devonian, Middle (393.3 - 382.7 million years)

Jurassic, Middle (174.1 - 163.5 million years)

Carboniferous, Pennsylvanian (323.2 - 298.9 million years)

Triassic, Lower (251.9 - 247.2 million years)

Devonian, Lower (419.2 - 393.3 million years)

Cenozoic (66 - 0 million years)

Carboniferous (358.9 - 298.9 million years)

Paleogene (66 - 23.03 million years)

Quaternary, Holocene (0.0117 - 0 million years)

Triassic, Middle (247.2 - 237 million years)

Paleogene, Oligocene (33.9 - 23.03 million years)

Stone

Coral

Blood Coral

Natural Pearl

Topaz

Pearl

Certification

No laboratory report

Faceted cut

Baroque

Oval

Exact colour

White

Mineral form

Freeform

Geode

Sphere

Pearl luster

Pearl surface quality

Clean

Size on item

54 (EU) / 14 (IT) / 6 ¾ (US)

Adjustable

55 (EU) / 15 (IT) / 7 ¼ (US)

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

50 (EU) / 10 (IT) / 5 ¼ (US)

After 2000

Before 1400

1900-2000

Treatment

Conserved

Polished

Composite

Original/ Replica

Original/official

Refurbished original

Reproduction/replica

Licensed replica

Specimen

Megalodon

Mosasaur

Trilobite

Ammonite

Dinosaur

Marine reptile

Fish

Fossils

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Large Ammonite - Fossilised shell - Perisphinctid

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