<![CDATA[1A Collections]]>

<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?sort_field=Dublin+Core%2CTitle&page=7&output=rss2 Tue, 09 Apr 2024 21:21:52 +0100 p1acollections@esc.cam.ac.uk (1A Collections) Zend_Feed http://blogs.law.harvard.edu/tech/rss <![CDATA[TF0208 Littorina muricata]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/145

Title

TF0208

Littorina muricata

Subject

Specimen Age

Jurassic

Location

Coralline Oolite, Upware, Cambridgeshire

Description

Species

Littorina muricata

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Littorina

Distinctive Features

Coiled shell (helical)
Spire
Body whorl

Preservation

External mould and external casts

]]> Fri, 21 Jun 2019 11:40:41 +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

]]> Thu, 20 Jun 2019 09:51:40 +0100 <![CDATA[TF0311 Ceratite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/76

Title

TF0311

Ceratite

Description

Species

Ceratites

Stratigraphic Range

Triassic

Taxonomy

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

Distinctive Features

Planispiral
Aperture
Body chamber
Ceratitic suture lines
Evolute

Preservation

Internal mould

Advanced notes

Set 1 specimen is a plaster cast

]]> Thu, 20 Jun 2019 09:48:59 +0100 <![CDATA[TF0321 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/75

Title

TF0321

Ammonite

Description

Species

Dactylioceras commune

Stratigraphic Range

Jurassic

Taxonomy

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

Distinctive Features

Ribs
Imprint of inner whorls visible
Curved shape (part of coil)

Preservation

Pyritised shell replacement

]]> Thu, 20 Jun 2019 09:46:09 +0100 <![CDATA[TF0322 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/74

Title

TF0322

Ammonite

Description

Species

Hildoceras bifrons

Stratigraphic Range

Jurassic

Taxonomy

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

Distinctive Features

Planispiral
Evolute
Ribs

Preservation

Mineral replacement of shell (aragonite to silica)

]]> Thu, 20 Jun 2019 09:44:28 +0100 <![CDATA[TF0323 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/73

Title

TF0323

Ammonite

Description

Species

Parkinsonia parkinsonia

Stratigraphic Range

Jurassic

Taxonomy

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

Distinctive Features

Planispiral
Evolute
Ribs
Ammonitic suture lines

Preservation

Calcite has replaced aragonite in the skeleton

Advanced notes

Beware! The specimen in set 2 has a dark circular hole, which you may be tempted to identify as a siphuncle. However remember that in ammonoids the siphuncle runs around the outer edge of the chambers, so this hole is in the wrong place. It is probably there due to eccentricities of the mineralisation process.

Why is it a dark colour when the rest of the shell is white? Generations of Earth Scientists have made the same mistake, their pencil marks fooling others into making the same error.

]]> Thu, 20 Jun 2019 09:37:02 +0100 <![CDATA[TF0324 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/72

Title

TF0324

Ammonite

Description

Species

Amoeboceras alternans

Stratigraphic Range

Jurassic

Taxonomy

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

Distinctive Features

Planispiral
Ammonitic suture lines visible on some moulds
Ribs

Preservation

Most external moulds, few examples of internal moulds, pyritised

]]> Thu, 20 Jun 2019 09:35:04 +0100 <![CDATA[TF0325 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/71

Title

TF0325

Ammonite

Description

Species

Deshayesites

Stratigraphic Range

Cretaceous

Taxonomy

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

Distinctive Features

Planispiral
Ammonitic suture pattern
Evolute
Ribs
Aperture

Preservation

Internal mould, with aperture partially crushed

]]> Thu, 20 Jun 2019 09:14:41 +0100 <![CDATA[TF0326 Ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/70

Title

TF0326

Ammonite

Description

Species

Anahoplites splendens

Stratigraphic Range

Cretaceous

Taxonomy

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

Distinctive Features

Planispiral
Involute
Ammonitic suture pattern
Ribs

Preservation

Internal mould, pyritised

Advanced notes

For the specimen in set 1 only part of the whole shell is present. The rest has either broken off or not been preserved at all.

]]> Thu, 20 Jun 2019 09:08:04 +0100 <![CDATA[TF0327 Heteromorphic ammonite]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/69

Title

TF0327

Heteromorphic ammonite

Description

Species

Scaphites

Stratigraphic Range

Cretaceous

Taxonomy

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

Distinctive Features

'g' shaped coiled shell
Ribs
Involute
Ammonitic suture lines

Preservation

Internal mould

Advanced notes

Heteromorphic ammonites (such as Scaphites) diversified during the late Cretaceous. They may have lived as planktonic or benthic organisms depending on where the centre of gravity lies in the shell, which is much dependent on the soft parts. Sadly these soft parts rarely preserve.

]]> Mon, 17 Jun 2019 16:42:18 +0100