<![CDATA[1A Collections]]>

<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?page=12&sort_field=Dublin+Core%2CTitle&output=rss2 Tue, 09 Apr 2024 21:23:13 +0100 p1acollections@esc.cam.ac.uk (1A Collections) Zend_Feed http://blogs.law.harvard.edu/tech/rss <![CDATA[TF1003 Didymograptus]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/149

Title

TF1003

Didymograptus

Subject

Specimen Age

Ordovician

Location

Llandeilo, Abereiddy Bay, Wales

Description

Stratigraphic Range

Ordovician

Taxonomy

Phylum: Hemichordata
Class: Graptolithina
Genus: Didymograptus

Distinctive Features

Stipes (2)
Thecae
Rhabdosome
Nema
'sawtooth'

Preservation

Flattened
Carbon film
Pale colourisation from chlorine inclusion into the fossil

Advanced notes

The 'sawtooth' faces are facing each other. This is therefore a relatively old two stiped graptolite from the Ordovician. One specimen shows two graptolites with nemas overlapping. At first glance this could be mistaken for a four stiped graptolite, such as Tetrapgraptus, but close examination reveals that there are two animals, squashed on top of each other.

]]> Fri, 21 Jun 2019 11:59:38 +0100 <![CDATA[TF1004 Horizontal didymograptid]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/150

Title

TF1004

Horizontal didymograptid

Subject

Specimen Age

Ordovician

Location

Australia

Description

Taxonomy

Phylum: Hemichordata
Class: Graptolithina

Distinctive Features

Stipes (2)
Nema
Horizontal
Thecae
Rhabdosome

Preservation

Compressed
Carbon film
Red colour from iron in sediment seeping into fossil

Advanced notes

The position of the nema tells us that there are two horizontal stipes and not one stipe. This allows identification as a Didymograptid and not as a Monograptid.

]]> Fri, 21 Jun 2019 12:01:51 +0100 <![CDATA[TF1005 Graptoloid graptolites]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/151

Title

TF1005

Graptoloid graptolites

Subject

Specimen Age

Ordovician

Location

Australia

Description

Stratigraphic Range

Ordovician

Taxonomy

Phylum: Hemichordata
Class: Graptolithina
Order: Graptoloidea

Distinctive Features

Stipes
Rhabdosome
Thecae
'sawtooth'

Preservation

Flattened
Red colour from iron in sediment seeping into fossil

Advanced notes

You can see a range of geometries on this specimen: scandent, horizontal and pendent.

]]> Fri, 21 Jun 2019 12:04:06 +0100 <![CDATA[TF1006 Spiral monograptids]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/152

Title

TF1006

Spiral monograptids

Description

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Hemichordata
Class: Graptolithina

Distinctive Features

Spiral stipes
Rhabdosome
Thecae
'sawtooth'

Preservation

Flattened
Carbon film

Advanced notes

You can see various preservational geometries in these slabs.

]]> Fri, 21 Jun 2019 12:05:24 +0100 <![CDATA[TF1101 Halysites]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/119

Title

TF1101

Halysites

Subject

Tabulate coral

Description

Stratigraphic Range

Silurian

Taxonomy

Phylum: Cnidaria
Class: Anthozoa
Order: Tabulata
Genus: Halysites

Distinctive Features

Halysites is a so-called 'chain coral'. Unsurprisingly it can be identified as it has a distinctive 'chain' appearance, each 'link' in the chain is a separate animal, all part of a larger colony.

Preservation

External mould

]]> Fri, 21 Jun 2019 09:19:17 +0100 <![CDATA[TF1102 Isastraea explanata]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/120

Title

TF1102

Isastraea explanata

Subject

Scleractinian coral

Specimen Age

Jurassic

Location

Coral Rag, Upware, Cambridgeshire

Description

Species

Isastraea explanata (also Isastrea explanata)

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Cnidaria
Class: Anthozoa
Order: Scleractinia
Genus: Isastrea

Distinctive Features

Septa
Weak columella

Preservation

External mould (of the 'top' of the scleractinian coral hard parts)

]]> Fri, 21 Jun 2019 09:23:53 +0100 <![CDATA[TF1103 Rugose coral]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/121

Title

TF1103

Rugose coral

Description

Stratigraphic Range

Ordovician to Permian

Taxonomy

Phylum: Cnidaria
Class: Anthozoa
Order: Tabulata

Distinctive Features

Septa
Colonial
Columella
Polyps

Preservation

Mineral replacement of skeleton
Precipitation of minerals in spaces

Advanced notes

The presence of columella (central support structures) and septa allow identification of this fossil as a colonial rugose specimen. Columella are not present in tabulate corals as these are always colonial, and do not need the extra support.
Solitary rugose corals developed columella as an internal support structure, and it was retained for some colonial forms, such as this one.

]]> Fri, 21 Jun 2019 09:25:51 +0100 <![CDATA[TF1104 Tabulate coral]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/122

Title

TF1104

Tabulate coral

Description

Stratigraphic Range

Ordovician to Permian

Taxonomy

Phylum: Cnidaria
Class: Anthozoa
Order: Tabulata

Distinctive Features

Tabulae
Colonial

Preservation

Mineral replacement of skeleton

Advanced notes

Due to the way that this specimen has been cut and polished, the tabulae are not immediately obvious. They are visible on parts of the slab, allowing for this to be identified as a tabulate coral.

You may recognise this specimen from the coffee table in the common room on the ground floor of the Earth Sciences Department. Have a go at identifying the other fossils in the table on your next coffee break!