<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?tags=Permian&output=rss2 Tue, 09 Apr 2024 21:16:23 +0100 p1acollections@esc.cam.ac.uk (1A Collections) Zend_Feed http://blogs.law.harvard.edu/tech/rss <![CDATA[TF0402 Belemnite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/82

Title

TF0402

Belemnite

Description

Stratigraphic Range

Carboniferous to Cretaceous

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida

Set 1:
Group: Cylindroteuthis
Set 2:
Group: unknown

Distinctive Features

Guard with radial calcite crystals
Crushed conical hole where phragmocone used to be
Long, near cylindrical shape

Preservation

Dissolution of phragmocone
Sediment infill of conical cavity where phragmocone used to be
Crushing of infilled phragmocone area
TF0402_HS.png
TF0402_sketch.png
]]> Thu, 20 Jun 2019 10:20:13 +0100 <![CDATA[TF0401 Belemnite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/81

Title

TF0401

Belemnite

Description

Stratigraphic Range

Carboniferous to Cretaceous

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida

Distinctive Features

Guard of radial calcite crystals
Conical cavity where phragmocone used to be

Preservation

Aragonitic phragmocone dissolved
Sediment infil of conical cavity where phragmocone used to be (set 1 only)
TF0401_HS.png
TF0401_sketch.png
]]> Thu, 20 Jun 2019 10:18:03 +0100 <![CDATA[Ammonoid]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/79

Title

Ammonoid

Description

Taxonomy

Phylum: Mollusca

Class: Cephalopoda

Subclass: Ammonoidea

Diagnostic features

[See labelled diagram above]

Aragonite shell

Septa

Suture (different for goniatites, ceratites and ammonites, see second diagram above)

Chambers

Siphuncle

Planispiral shape, involute or evolute (see third diagram on right hand side)

Stratigraphic range

Devonian to Cretaceous

Way of life

Nektonic (jet propelled)

Predatory

Marine

Common preservation

Internal mould

Learn about types of preservation

Advanced notes

Ammonoids could passively remove or add water to chambers via the siphuncle. This allowed them to change their density, and maintain neutral buoyancy with the surrounding seawater. This meant that they were able to swim as efficiently as possible.

Ammonoids are extremely good index fossils on account of their diverse morphologies, good preservation potentials and widespread fossil locations.

Specimens

Browse ammonoids

External links

Telling planispiral fossils apart

ammonoid_sketch.png
ammonoid_suture_sketch.png
ammonoid_sketch_2.png
]]> Thu, 20 Jun 2019 10:01:51 +0100 <![CDATA[TF0301 Goniatite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/77

Title

TF0301

Goniatite

Description

Species

Goniaites

Stratigraphic Range

Devonian to Permian

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Goniatitida

Distinctive Features

Planispiral shell
Goniatitic suture lines
Involute

Preservation

Internal mould
TF0301_HS.png
TF0301_sketch.png
]]> Thu, 20 Jun 2019 09:51:40 +0100