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Jurassic Jumper
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Reply with quote  #1 
Same Calliostoma sp. as shown in post #1 above (Calliostoma subexcavatum), but with close-up of (almost) complete underside shown for diagnostic purposes.

Found on the foreshore at Ramsholt, Suffolk.

08012009130956.jpg 

(NB. scale in cm)

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Reply with quote  #2 
Searlesia costifera.

Found in Red Crag slippages at Walton-on-the-Naze, Essex.

Range of species: Coralline Crag - Red Crag; N. Atlantic at present day.

Diagnostics: Thick shell wall with rounded and distinct (evenly spaced) growth ridges that become less pronounced toward the shell aperture in adult specimens. Also has numerous, fine, evenly spaced striations running perpendicular to the growth ridges that, unlike the growth ridges, seem not to become less distinct towards the shell aperture.

Size: Up to at least 4.5cm, possibly more.

Reference: British Caenozoic Fossils (NHM) plate 40, ISBN 1-898298-77-7.

08012009135604.jpg 

(NB. scale in cm)

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Reply with quote  #3 
Neptunea contraria (NB. often mis-spelt as "Neptunia")

Found on the foreshore at Ramsholt, Suffolk.

Range of species: Red Crag - late Pleistocene.

Diagnostics: Thick and robust shell wall (eg. Ramsholt), though sometimes thinner and more fragile (eg. Walton-on-the-Naze). Colouration varies (depending upon location as well as other factors), but includes shades of brown, orange, red, yellow, peach, cream, white, and may occasionally be tinted blue. Left-handed spiral. The umbilicus, although often broken off, is usually white irrespective of the rest of the shell's colouration. Often lacks external ornamentation, but growth lines and ridges are not uncommon, although small and usually more pronounced towards the shell aperture.

Size: Up to at least 11cm, possibly more.

Reference: British Caenozoic Fossils (NHM) plate 40, ISBN 1-898298-77-7.

08012009143001.jpg 

08012009144347.jpg 

(NB. scale in cm)


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Name: Turritella incrassata.

Location: Found on the foreshore at Ramsholt, Suffolk.

Range: Coralline Crag - Corton Beds.

Diagnostics: This particular Turritella species has far flatter sides than other Turritella and Turritella-like species (such as Ptychopotamides tricinctus) that occur in the same strata. Surface ornamentation consists primarily of three distinct ridges, running parallel in the downward-spiralling direction of the whorls, and when viewed upright (from the side, as in the picture below), these ridges lie closer to the lower portion of the whorls than the upper one.

Size: Max height from apex to aperture is up to 5.5cm, though possibly more.

Reference: British Caenozoic Fossils (NHM) plate 39, ISBN 1-898298-77-7.

09012009012951.jpg 

(NB. scale in cm)

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Reply with quote  #5 
Name: Colus curtus.

Location: Found on the foreshore at Ramsholt, Suffolk.

Range: Red Crag.

Diagnostics: The upper edge of each whorl curves up from the bottom, then round and (slightly) back down towards the join with the preceding whorl (above), forming a distinct grove-like channel. The syphonal canal curves markedly away (to the left) from the shell aperture. Shell ornamentation consists of faint growth lines and ridges, which in the case of ridges, often, but not always, become more pronounced towards the shell aperture in more mature specimens.

Size: Max height from apex to syphonal canal up to 5cm, though broken examples found at both Walton-on-the-Naze and Ramsholt suggest up to at least 6cm, if not more.

Reference: British Caenozoic Fossils (NHM) plate 40, ISBN 1-898298-77-7.

09012009015418.jpg 

(NB. scale in cm)

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Reply with quote  #6 
Name: Natica multipunctata.

Location: Found in the slippages at Walton-on-the-Naze.

Range: Coralline Crag - Red crag.

Diagnostics: Has a thick shell wall, and a (thick) distinct ridge inside the syphonal cavity that runs parallel to the direction of the whorls. Easily confused with the very similar Lunatia catenoides, but the height to width ratio is noticably greater in N. multipunctata. Its most distinctive diagnostic feature is the multitude of regularly spaced circular orange spots on the surface, hence the name "multipunctata", but these are often faded on fossil specimens. The two pictures below demonstrate this. In the rectangle on the upper picture, faint orange spots are barely visible, while in the bottom one, I've replaced some of them with brighter spots (fractionally smaller than the real ones). Hope this helps!

Size: Max diameter up to at least 3.7cm, though possibly more.

References: British Caenozoic Fossils (NHM) plate 39, ISBN 1-898298-77-7.

09012009021642.jpg 

09012009113939.jpg 

(NB. scale in cm)

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Reply with quote  #7 
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Calliostoma sp.

Found in situ in red crag at Walton on the Naze, Essex

Range of species: Coralline crag- Red crag

Diagnostics: Distinct overall profile and ornamentation on all of the whorls.

Size: (aperture-apex) up to 30mm

Reference: British caenozoic fossils (nhm) plate 39



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Trivia sp.

Found washed from red crag in beach shingle, Walton on the Naze, Essex

Range of species: Coralline crag- red crag

Diagnostics: Very compact profile, aperture reduced to narrow slightly curved slit, prominent striations in shells.

Size: (from one end of aperture to the other) up to 15mm

Reference: British caenozoic fossils (nhm) plate 39




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Aporrhais pespelecani

Found in situ in Red crag, Walton on the Naze, Essex

Range of species: Neogene-recent

Diagnostics: Outer lip on the aperture is developed into a large elaborate wing shape which is often compared to a pelicans foot hence its common name of the pelicans foot shell. The whorls have some ornamentation on them although this is often worn on fossilized specimens.

Size: (Aperture-apex) up to 45mm

Reference: http://www.marlin.ac.uk/species/Aporrhaispespelecani.htm (modern specimens)

(Example shown is badly broken)

20062008154319.jpg 




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20062008155507.jpg 


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