<![CDATA[1A Collections]]>

<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?tags=branching&output=rss2 Tue, 09 Apr 2024 21:16:05 +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[TF1002 Graptoloid graptolite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/148

Title

TF1002

Graptoloid graptolite

Subject

Specimen Age

Ordovician

Location

Australia

Description

Stratigraphic Range

Ordovician

Taxonomy

Phylum: Hemichordata
Class: Graptolithina
Order: Graptoloidea

Distinctive Features

Thecae
Stipes
Rhabdosome
Nema

Preservation

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

Advanced notes

The number of stipes decreased over time, from 4 to 3 to 2. This specimen has 3 stipes, placing it between four stiped animals such as Tetragraptus and two stiped animals such as Didymograptus in time.

]]> Fri, 21 Jun 2019 11:50:36 +0100 <![CDATA[TF1001 Dendroid graptolites]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/146

Title

TF1001

Dendroid graptolites

Description

Stratigraphic Range

Cambrian to Carboniferous

Taxonomy

Phylum: Hemichordata
Class: Graptolithina
Order: Dendroidea

Distinctive Features

Numerous branching stipes
Colonial
Thecae

Preservation

Flattened

Advanced notes

In this specimen we cannot see the size of a potential holdfast. Because of this we cannot say if this is a planktonic or benthic animal.

Dendroid graptolites began as benthic organisms attaching to the seafloor with a holdfast, but some diversified as planktonic animals, with a reduced holdfast.

]]> Fri, 21 Jun 2019 11:45:55 +0100