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Manuel Quiring

Beautiful ammonite. 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 - 20 cm

Fossils

Reserve price

No reserve price

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Closing date

Saturday

Sunday

Monday

Tuesday

Friday

tomorrow

Budget

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Location

The Netherlands

Italy

Spain

Taiwan

France

Germany

Hong Kong

Lithuania

Poland

Belgium

United States

Romania

Sweden

United Kingdom

Austria

Bulgaria

Switzerland

Portugal

Singapore

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 matrix

Fossilised shell

Fossil fragment

Fossil skeleton

Fossil plate matrix

Fossilised plant

Fossil teeth

Fossil skull

Fossil cabochon

Raw mineral

Fossil vertebra bone

Fossil carapace

Ring

Fossilised claw

Fossil mortality plate

Fossilised wood

Metaphysical stones

Earrings

Fossilised jaw

Fossilised tusk

Fossil bone

Carved mineral

Country of origin

Morocco

Indonesia

Asia

China

North America

Madagascar

Myanmar

Baltic states

Brazil

Russia

Netherlands

U.S.

Africa

Lebanon

Algeria

Canada

Malta

Material

Silver

Gold-plated

Yellow gold

Marble

Bronze

Gender

Women

Unisex

Condition

Natural

Restored

Enhanced

Manipulated

As new - unused

Reassembled

Composed

Excellent condition - barely used with minimal signs of wear

Good condition

Hand carved

Reconstructed

Excellent condition

Very good +

Period

Cretaceous (145 - 66 million years)

Neogene, Miocene (23.03 - 5.33 million years)

Neogene (23.03 - 2.58 million years)

Cretaceous, Upper (100.5 - 66 million years)

Paleogene, Eocene (56 - 33.9 million years)

Devonian (419.2 - 358.9 million years)

Cretaceous, Lower (145 - 100.5 million years)

Triassic (251.9 - 201.3 million years)

Jurassic, Lower (201.3 - 174.1 million years)

Quaternary, Pleistocene (2.58 - 0.0117 million years)

Devonian, Middle (393.3 - 382.7 million years)

Jurassic (201.3 - 145 million years)

Ordovician (485.4 - 443.8 million years)

Triassic, Middle (247.2 - 237 million years)

Triassic, Lower (251.9 - 247.2 million years)

Carboniferous, Pennsylvanian (323.2 - 298.9 million years)

Cenozoic (66 - 0 million years)

Jurassic, Upper (163.5 - 145 million years)

Jurassic, Middle (174.1 - 163.5 million years)

Neogene, Pliocene (5.33 - 2.58 million years)

Devonian, Lower (419.2 - 393.3 million years)

Cambrian (541 - 485.4 million years)

Quaternary, Holocene (0.0117 - 0 million years)

Permian, Cisuralian (298.9 - 272.95 million years)

Carboniferous, Mississippian (358.9 - 323.2 million years)

Stone

Coral

Peridot

Turquoise

Natural Pearl

Topaz

Garnet

Pearl

Certification

No laboratory report

Style

Paleolithic

Art Deco

Faceted cut

Baroque

Round

Oval

Pear

Marquise

Exact colour

White

Mineral

Amethyst

Mineral form

Geode

After 2000

1900-2000

Before 1400

Treatment

Conserved

Polished

Composite

Size on item

Adjustable

54 (EU) / 14 (IT) / 6 ¾ (US)

53 (EU) / 13 (IT) / 6 ¼ (US)

Large (18 - 18.5 cm)

Pearl surface quality

Lightly spotted

Pearl luster

Good

Original/ Replica

Original/official

Refurbished original

Specimen

Megalodon

Fossils

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Large Ammonite - Fossilised shell - Perisphinctid - 20 cm

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