https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?page=11&output=atom <![CDATA[1A Collections]]> 2024-04-09T21:22:41+01:00 Omeka https://wserv3.esc.cam.ac.uk/p1acollections/items/show/169 <![CDATA[<h2>Lamellar twinning</h2>]]> 2019-07-04T09:52:57+01:00

Title

Lamellar twinning

Subject

Many parallel twins can be produced within one mineral grain by multiple parallel twin planes. This is known as lamellar twinning. It is a diagnostic characteristic of plagioclase feldspar, and is sometimes referred to as albite twinning.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/168 <![CDATA[<h2>Albite twinning</h2>]]> 2019-07-04T09:52:56+01:00

Title

Albite twinning

Subject

Named after albite (Na-plagioclase) twinning on the (010) crystallographic plane.
See lamellar twinning.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/167 <![CDATA[<h2>Aeolian</h2>]]> L326) in the 1A Reference Series.]]> 2019-07-04T09:52:56+01:00

Title

Aeolian

Subject

Relating to or arising from the action of the wind; aeolian sediments are wind-blown. Also spelt eolian.

Description

Have a look at the ferruginous arenite sandstone (L326) in the 1A Reference Series.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/166 <![CDATA[<h2>Adamantine [lustre]</h2>]]> 2019-07-04T09:52:56+01:00

Title

Adamantine [lustre]

Subject

Minerals displaying a diamond-like lustre are described as adamantine. These minerals are transparent or translucent and have very high refractive indices, producing the high degree of lustre. Zeolites, for example, have adamantine lustre.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/165 <![CDATA[<h2>Acicular</h2>]]> 2019-07-04T09:52:56+01:00

Title

Acicular

Subject

Acicular means needle-shaped. The term is usually applied to crystal form.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/164 <![CDATA[<h2><strong>TF0625<br /></strong></h2> <h2>Acaste downingiae</h2>]]>

Species

Acaste downingiae

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Family: Acastidae
Genus: Acaste

Distinctive Features

Glabella (with ridges)
Eyes
Cephalon
Thorax
Pygidium

Preservation

External mould (manmade cast)
]]> 2019-07-04T09:52:55+01:00

Title

TF0625

Acaste downingiae

Description

Species

Acaste downingiae

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Family: Acastidae
Genus: Acaste

Distinctive Features

Glabella (with ridges)
Eyes
Cephalon
Thorax
Pygidium

Preservation

External mould (manmade cast)
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/163 <![CDATA[<h2><strong>TF0624<br /></strong></h2> <h2>Homalonotus delphinocephalus</h2>]]>

Species

Homalonotus delphinocephalus

Stratigraphic Range

Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Homalonotus

Distinctive Features

Cephalon
Thorax
Pygidium
Eyes (holochroal)

Preservation

External mould (manmade cast)
]]> 2019-07-04T09:52:55+01:00

Title

TF0624

Homalonotus delphinocephalus

Description

Species

Homalonotus delphinocephalus

Stratigraphic Range

Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Homalonotus

Distinctive Features

Cephalon
Thorax
Pygidium
Eyes (holochroal)

Preservation

External mould (manmade cast)
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/162 <![CDATA[<h2><strong>TF0623<br /></strong></h2> <h2>Dalmanites</h2>]]>

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Dalmanites

Distinctive Features

Schizochroal eyes
Thorax
Cephalon
Pygidium

Preservation

External mould (manmade cast)

Advanced notes

Dalmanites always has 11 segments in the thorax
]]> 2019-07-04T09:52:55+01:00

Title

TF0623

Dalmanites

Subject

Specimen Age

Silurian

Description

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Dalmanites

Distinctive Features

Schizochroal eyes
Thorax
Cephalon
Pygidium

Preservation

External mould (manmade cast)

Advanced notes

Dalmanites always has 11 segments in the thorax
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/161 <![CDATA[<h2><strong>TF0622<br /></strong></h2> <h2>Calymene blumenbachi</h2>]]>

Species

Calymene blumenbachi

Stratigraphic Range

Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Calymene

Distinctive Features

Cephalon
Thorax
Pygidium
Eyes

Preservation

External mould

Advanced notes

Calymene blumenbachi likely lived as a predatory or scavenging animal in shallow waters. Its good vision would have allowed it to identify suitable prey/food.
]]> 2019-07-04T09:52:54+01:00

Title

TF0622

Calymene blumenbachi

Description

Species

Calymene blumenbachi

Stratigraphic Range

Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Genus: Calymene

Distinctive Features

Cephalon
Thorax
Pygidium
Eyes

Preservation

External mould

Advanced notes

Calymene blumenbachi likely lived as a predatory or scavenging animal in shallow waters. Its good vision would have allowed it to identify suitable prey/food.
]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/160 <![CDATA[<h2><strong>TF0614<br /></strong></h2> <h2>Odontopleurid</h2>]]>

Stratigraphic Range

Ordovician to Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Odontopleurida
Family: Odontopleuridae

Distinctive Features

Cephalon
Thorax
Pygidium
Spines

Preservation

External mould (manmade cast)
]]> 2019-07-04T09:52:54+01:00

Title

TF0614

Odontopleurid

Description

Stratigraphic Range

Ordovician to Silurian

Taxonomy

Phylum: Arthropoda
Class: Trilobita
Order: Odontopleurida
Family: Odontopleuridae

Distinctive Features

Cephalon
Thorax
Pygidium
Spines

Preservation

External mould (manmade cast)
]]>