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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.

Fossilised shell

Large Ammonite - Fossilised shell - Perisphinctid

Fossils

Reserve price

No reserve price

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Closing date

Saturday

Friday

Sunday

Monday

tomorrow

Budget

From

Location

The Netherlands

Italy

France

Spain

Lithuania

Germany

Taiwan

Hong Kong

United States

Belgium

Poland

Sweden

Türkiye

Austria

Denmark

Bulgaria

Czech Republic

United Kingdom

Japan

Portugal

Dimensions

Height

Width

Depth

Object

Fossil tooth

Fossilised animal

Amber

Fossil teeth

Fossil skeleton

Fossil skull

Fossil matrix

Raw mineral

Fossil bone

Taxidermy replica mount

Fossil fragment

Fossil carapace

Fossilised plant

Ring

Fossil plate matrix

Fossilised jaw

Necklace

Fossil vertebra bone

Fossilised claw

Fossil mortality plate

Carved mineral

Earrings

Bracelet

Skull

Country of origin

Morocco

Madagascar

North America

Indonesia

Netherlands

Asia

China

Lebanon

Brazil

Myanmar

Russia

U.S.

Baltic states

Turkey

Africa

Afghanistan

Algeria

Material

Silver

Gold-plated

Marble

Bronze

Gender

Women

Unisex

Condition

Natural

Restored

Good condition

Enhanced

Composed

As new - unused

Manipulated

Reconstructed

Cast

Reassembled

Excellent condition

Excellent condition - barely used with minimal signs of wear

Good condition - used with small signs of aging & blemishes

Period

Cretaceous (145 - 66 million years)

Neogene, Miocene (23.03 - 5.33 million years)

Cretaceous, Upper (100.5 - 66 million years)

Paleogene, Eocene (56 - 33.9 million years)

Quaternary, Pleistocene (2.58 - 0.0117 million years)

Cretaceous, Lower (145 - 100.5 million years)

Neogene (23.03 - 2.58 million years)

Devonian (419.2 - 358.9 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)

Triassic, Middle (247.2 - 237 million years)

Paleogene, Oligocene (33.9 - 23.03 million years)

Ordovician (485.4 - 443.8 million years)

Devonian, Middle (393.3 - 382.7 million years)

Paleozoic (541 - 251.9 million years)

Cambrian (541 - 485.4 million years)

Triassic, Lower (251.9 - 247.2 million years)

Carboniferous, Pennsylvanian (323.2 - 298.9 million years)

Quaternary (2.58 - 0 million years)

Permian (298.9 - 251.9 million years)

Jurassic, Middle (174.1 - 163.5 million years)

Triassic, Upper (237 - 201.3 million years)

Ordovician, Middle (470 - 458.4 million years)

Stone

Coral

Blood Coral

Lapis lazuli

Pearl

Natural Pearl

Turquoise

Rhodolite

Akoya cultured pearl

Sapphire

Amethyst

Aquamarine

Certification

No laboratory report

Non-CITES species

Style

Art Deco

Vintage

Signature

Not signed

Faceted cut

Round

Circle

Baroque

Exact colour

White

Mineral

Citrine

Labradorite

Quartz

Mineral form

Geode

Freeform

After 2000

Before 1400

1900-2000

Treatment

Conserved

Polished

Composite

Size on item

Adjustable

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

Large (18 - 18.5 cm)

53 (EU) / 13 (IT) / 6 ¼ (US)

56 (EU) / 16 (IT) / 7 ½ (US)

58 (EU) / 18 (IT) / 8 ¼ (US)

Pearl surface quality

Lightly spotted

Clean

Pearl luster

Good

Original/ Replica

Fossils

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Large Ammonite - Fossilised shell - Perisphinctid

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