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Manuel Quiring

Bellissimo enorme piastra con diversi esempliri di Orthoceras proveniente dal Marocco. Questi animali marini sono stati tra le prime forme viventi ad abitare il pianeta. Ritrovamento Sahara nord occidentale.
Gli Orthoceras sono molluschi cefalopodi estinti, appartenenti ad un gruppo ormai scomparso. Queste creature marine vivevano negli oceani diverse centinaia di milioni di anni fa, principalmente durante i periodi Ordoviciano e Siluriano. Il loro nome, che in greco significa “corno dritto”, si riferisce alla caratteristica forma della loro conchiglia conica e allungata. Questo guscio era diviso in ambienti, separati da tramezzi, e attraversati da un sifone.
Il guscio di Orthoceras è probabilmente la loro caratteristica più distintiva. Era costituito da aragonite, minerale che forma anche le conchiglie di molti molluschi attuali. Nel corso del tempo, e sotto l'effetto di processi geologici quali sedimentazione e mineralizzazione, queste conchiglie si fossilizzarono, dando origine agli esemplari che ammiriamo oggi.
I fossili di Orthoceras sono preziosi testimoni della vita marina di un'epoca passata. Il loro studio permette agli scienziati di ricostruire antichi ecosistemi, comprendere l'evoluzione delle specie e comprendere meglio i principali cambiamenti che hanno segnato la storia della Terra.

Ordovician (485.4 - 443.8 million years) - Morocco

Orthoceras - Fossilised animal - 30 cm

Fossils

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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

Fossil skull

Fossilised shell

Fossil skeleton

Fossil teeth

Raw mineral

Fossil carapace

Fossil plate matrix

Fossilised plant

Fossil fragment

Taxidermy replica mount

Fossil cabochon

Fossil mortality plate

Fossilised wood

Fossilised jaw

Fossilised egg

Ring

Fossilised tusk

Necklace

Full skeleton with skull

Fossil vertebra bone

Fossilised claw

Country of origin

Morocco

Madagascar

Indonesia

Asia

China

North America

Netherlands

Brazil

Lebanon

Myanmar

Baltic states

Africa

Canada

Russia

U.S.

Algeria

Europe

Material

Silver

Gold-plated

Yellow gold

Marble

Bronze

Gender

Women

Unisex

Condition

Natural

Restored

Enhanced

Composed

Good condition

Reconstructed

Manipulated

Cast

As new - unused

Reassembled

Very good +

Excellent condition - barely used with minimal signs of wear

Good condition - used with some signs of wear

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)

Devonian (419.2 - 358.9 million years)

Cretaceous, Lower (145 - 100.5 million years)

Triassic (251.9 - 201.3 million years)

Neogene (23.03 - 2.58 million years)

Quaternary, Pleistocene (2.58 - 0.0117 million years)

Jurassic (201.3 - 145 million years)

Jurassic, Upper (163.5 - 145 million years)

Jurassic, Lower (201.3 - 174.1 million years)

Devonian, Middle (393.3 - 382.7 million years)

Ordovician (485.4 - 443.8 million years)

Triassic, Middle (247.2 - 237 million years)

Carboniferous, Pennsylvanian (323.2 - 298.9 million years)

Jurassic, Middle (174.1 - 163.5 million years)

Triassic, Lower (251.9 - 247.2 million years)

Paleogene (66 - 23.03 million years)

Cenozoic (66 - 0 million years)

Paleogene, Oligocene (33.9 - 23.03 million years)

Devonian, Lower (419.2 - 393.3 million years)

Quaternary (2.58 - 0 million years)

Permian (298.9 - 251.9 million years)

Quaternary, Holocene (0.0117 - 0 million years)

Stone

Coral

Topaz

Turquoise

Blood Coral

Rhodolite

Amethyst

Peridot

Hessonite

Certification

No laboratory report

Non-CITES species

Fineness

18 kt.

Style

Neolithic

Art Deco

Signature

Not signed

Faceted cut

Round

Oval

Cabochon cut

Mineral

Mineral form

Geode

Sphere

After 2000

Before 1400

1900-2000

Treatment

Conserved

Polished

Size on item

56 (EU) / 16 (IT) / 7 ½ (US)

Adjustable

54 (EU) / 14 (IT) / 6 ¾ (US)

55 (EU) / 15 (IT) / 7 ¼ (US)

Large (18 - 18.5 cm)

Original/ Replica

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Orthoceras - Fossilised animal - 30 cm

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