https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?tags=Calcite&output=atom <![CDATA[1A Collections]]> 2024-04-09T21:16:06+01:00 Omeka https://wserv3.esc.cam.ac.uk/p1acollections/items/show/129 <![CDATA[<h2><strong>TF0804<br /></strong></h2> <h2>Apiocrinites</h2>]]>

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Echinodermata
Class: Crinoidea
Order: Millericrinida
Genus: Apiocrinites

Distinctive Features

Pentaradial symmetry
Calyx
Attachment point for 'arms' of the animal

Preservation

Cast (manmade)
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Title

TF0804

Apiocrinites

Subject

Location

Bradford Clay

Description

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Echinodermata
Class: Crinoidea
Order: Millericrinida
Genus: Apiocrinites

Distinctive Features

Pentaradial symmetry
Calyx
Attachment point for 'arms' of the animal

Preservation

Cast (manmade)
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/127 <![CDATA[<h2><strong>TF0802<br /></strong></h2> <h2>Actinocritus (stem segments)</h2>]]>

Stratigraphic Range

Carboniferous

Taxonomy

Phylum: Echinodermata
Class: Crinoidea

Distinctive Features

Ossicles (fused)
Stereome

Preservation

Mineral replacement
Sediment infill
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Title

TF0802

Actinocritus (stem segments)

Subject

Location

Carboniferous limestone, Whatley

Description

Stratigraphic Range

Carboniferous

Taxonomy

Phylum: Echinodermata
Class: Crinoidea

Distinctive Features

Ossicles (fused)
Stereome

Preservation

Mineral replacement
Sediment infill
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/83 <![CDATA[<h2><strong>TF0403<br /></strong></h2> <h2>Belemnite</h2>]]>

Species

Hastatus

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida
Genus: Hibolites

Distinctive Features

'Bullet' shape
Guard with radial crystals
Hollow phragmocone area

Preservation

Mineral replacement of calcitic guard
Dissolution of aragonitic phragmocone
Sediment infil of phragmocone area

Advanced notes

Hibolites are not as bullet shaped as most belemnites, and at first glance could be confused with an Echinoid spine. However the radial arrangement of crystals and the presence of a hollow region where the phragmocone would once have been allows us to, after some examination, confirm these specimens as belemnites.
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Title

TF0403

Belemnite

Subject

Location

Oxford Clay, Warboys Pit, St Ives

Description

Species

Hastatus

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida
Genus: Hibolites

Distinctive Features

'Bullet' shape
Guard with radial crystals
Hollow phragmocone area

Preservation

Mineral replacement of calcitic guard
Dissolution of aragonitic phragmocone
Sediment infil of phragmocone area

Advanced notes

Hibolites are not as bullet shaped as most belemnites, and at first glance could be confused with an Echinoid spine. However the radial arrangement of crystals and the presence of a hollow region where the phragmocone would once have been allows us to, after some examination, confirm these specimens as belemnites.
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