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Zugodactylites braunianus (d'ORBIGNY 1845)

13092006190103.jpg 

Size : 3" / 8 cm
Location : Port Mulgrave
Age : Upper Lias, bifrons zone, braunianus subzone, Cement shales

Diagnostics : 70 straight primary ribs per whorl at 8 cm, whorls compressed, oval in section. The ribs form small tubercles when parting to create secondary ribs that run across the venter. At the adult stage a well developed constriction before the mouth border can be seen on the internal mould.

Differential diagnostics : Tubercles not as prominently and regularly developed as in Peronoceras, whorls more depressed than Dactylioceras.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.
It is rather more rare than the "common" Dactylioceras.

References : M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978




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Pseudolioceras (Pseudolioceras) lythense (YOUNG & BIRD, 1828)

14092006190118.jpg 

Size : 3" / 8 cm
Location : Glacial drift, Stoupe Beck Sands, Robin Hoods Bay
Age : Upper Lias, bifrons zone

Diagnostics : 

Rather flat, discus shaped ammonite with a good keel.
The umbilical width is rather small and the umbilical walls are quite steep. The ribs perform a typical sinuous curve.
The living chamber of the ammonite is usually not well preserved, i.e. compressed.

Differential diagnostics : 

The umbilical width of this species is bigger than that of P. boulbiense, the umbilical walls are less steep.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992



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Pseudolioceras (Pseudolioceras) boulbiense (YOUNG & BIRD, 1822)

14092006193249.jpg 

Size : 3" / 8 cm
Location : Ravenscar
Age : Upper Lias, thouarense Zone, striatulum subzone, Striatulum shales

Diagnostics : 

Rather flat, discus shaped ammonite with a good keel.
The umbilical width is very small and the umbilical walls are very steep. The ribs perform a typical sinuous curve.
The living chamber of the ammonite is usually not well preserved, i.e. compressed.

Differential diagnostics : 

The umbilical width of this species is smaller than that of P. lythense, the umbilical walls are more steep.

Distribution : In Yorkshire the ammonite can be found at Ravenscar.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992



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Dactylioceras (Orthodactylites) tenuicostatum (YOUNG & BIRD, 1822)

15092006185954.jpg 

Size : 2.5" / 7 cm
Location : Kettleness
Age : Upper Lias, tenuicostatum Zone, tenuicostatum subzone, Grey shales

Diagnostics : Round whorl section, very fine ribbing, about 120 primary ribs / whorl at 7 cm. 
The ammonite develops a constriction before the mouth border at the adult stage.

Differential diagnostics : Whorl section more round and more evolute than D. semicelatum.

Distribution : In Yorkshire the ammonite can be found at Kettleness to Sandsend, Port Mulgrave, Hawsker. 

References : W.T. Dean, D.T. Donovan, M.K. Howarth : The liassic ammonite zones and subzones of the north-west european province, BMNH, London 1961



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Dactylioceras commune (SOWERBY, 1815)

15092006192123.jpg 

Size : 4" / 10 cm
Location : Port Mulgrave
Age : Upper Lias, bifrons Zone, commune subzone, Alum shales

Diagnostics : Rounded whorl section, fine ribbing, about 50-60 primary ribs / whorl at 10 cm. 
The ammonite develops a constriction and collar before the mouth border at the adult stage.

Differential diagnostics : D. atlethicum has finer ribs and a more oval whorl section.

Distribution : In Yorkshire the ammonite can be found at Kettleness to Sandsend, Port Mulgrave, Hawsker, Ravenscar. D. commune is the most common ammonite on the Yorkshire coast, and one that has quite a variability.

References : W.T. Dean, D.T. Donovan, M.K. Howarth : The liassic ammonite zones and subzones of the north-west european province, BMNH, London 1961




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Harpoceras falciferum (SOWERBY, 1820)

16092006120515.jpg 
Picture provided by Smiffy

Size : 7.5" / 19 cm
Location : Sandsend
Age : Upper Lias, falciferum Zone, falciferum subzone

Diagnostics : The ammonite shell is coiled with involutes whorls which overlap. Only part of the inner whorls can be seen. There is a sharp keel running round the ventral surface. The ribs of the shell are typically sickle shaped.

Differential diagnostics : The umbilical walls of H. falciferum are vertical, sometimes even undercut, while the umbilical walls of H. serpentinum are more sloping.

Distribution : In Yorkshire the ammonite can be found at Kettleness to Sandsend, Port Mulgrave, Hawsker, Ravenscar.

References : M.K. Howarth : The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain, 
Palaeontographical Society, London 1992



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Frechiella subcarinata (YOUNG & BIRD, 1822)

17092006155515.jpg 

Size : 4" / 10 cm
Location : Hawsker 
Age : Upper Lias, bifrons zone, commune Subzone, Alum shales

Diagnostics : 

Involute ammonite with thick swollen whorls and a faint keel on the venter. Smooth ribs, simplified suture.
The living chamber of the ammonite is usually not well preserved, i.e. compressed.

Differential diagnostics : Not unlike Phylloceras, but with thicker whorls and a keel. The simplified "ceratitic" sutures are the distinguishing element.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.
Frechiella is one of the rarest ammonites in the upper lias in Yorkshire.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992



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Peronoceras subarmatum (YOUNG & BIRD 1822)

18092006182821.jpg 

Size : 2.5" / 7 cm
Location : Whitby
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : The ribs of Peronoceras form ventrolateral tubercles or spines. The coronate whorls are depressed.

Differential diagnostics : In the inner whorls of P. subarmatum , two ribs are joined together in one tubercle, whereas in P. perarmatum there is usually only one rib per tubercle. 

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.


References : M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978




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Peronoceras perarmatum (YOUNG & BIRD 1822)

18092006184029.jpg 

Size : 2.5" / 7 cm
Location : Whitby
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : The ribs of Peronoceras form ventrolateral tubercles or spines. The coronate whorls are depressed.

Differential diagnostics : In the inner whorls of P. subarmatum , two ribs are joined together in one tubercle, whereas in P. perarmatum there is usually only one rib per tubercle. P. perarmatum has thicker whorls than P. subarmatum, the ribs are wider spaced.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.


References : M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978




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Lytoceras sublineatum(OPPEL, 1856)

18092006184630.jpg 
18092006185508.jpg 


Size : 2" / 5 cm
Location : Ravenscar
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : Typical Lytoceras with strong fimbriation on smooth ribs, very thick whorls.

Differential diagnostics : Much thicker whorls than L. cornucopia, narrower umbilicus.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.
Seems to be rather rare.


References : 
Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992
Rulleau : ƒÆ’¢â‚¬°volution et systƒÆ’‚©matique des Phylloceratidae et des Lytoceratidae du Toarcien et du Dogger infƒÆ’‚©rieur de la rƒÆ’‚©gion Lyonnaise, Lyon 1998




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Lytoceras jurense(ZIETEN, 1833)



Size : 1.5" / 4 cm
Location : Ravenscar
Age : Upper Lias, thouarsense zone, striatulum subzone, striatulum shales

Diagnostics : The internal mould is completely smooth, if preserved with shell, the shell shows very fine ribbing. Oval whorl section.

Differential diagnostics : The ribbing of L. fimbriatum is still evident also on the internal mould, while with L. jurense, it is completely smooth.

Distribution : In Yorkshire the ammonite can be found at Ravenscar. Seems to be rather rare.

References : 
Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992
Rulleau : ƒÆ’¢â‚¬°volution et systƒÆ’‚©matique des Phylloceratidae et des Lytoceratidae du Toarcien et du Dogger infƒÆ’‚©rieur de la rƒÆ’‚©gion Lyonnaise, Lyon 1998




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Dactylioceras athleticum(SIMPSON 1855)

02102006175840.jpg 

Size : 2.75" / 7 cm
Location : Ravenscar
Age : Upper Lias, bifrons zone, commune subzone

Diagnostics : Oval whorl section, fine ribbing, about 50-60 primary ribs / whorl. The number of ribs per whorl is constant from inner to outer whorls.

Differential diagnostics : 
More oval whorl section than D. commune, ribs on venter "leaning forward", almost forming a "v" shape on the venter. Number of ribs per whorl constant in D. athleticum, whereas in D. commune the outer whorls have less ribs than the inner whorls.

Differentiation between D.commune and D. athleticum not always easy.

Distribution : 
In Yorkshire the ammonite can be found at Ravenscar, Hawsker, Whitby, Port Mulgrave, Kettleness. 

References : 
Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992

Additional picture :
Direct comparison of D. athleticum (left) and D. commune (right), view on the venter of last whorl of specimens of nearly comparable size.

02102006183036.jpg 




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Peronoceras fibulatum (SOWERBY 1823)

03102006135625.jpg 

Size : 2 3/8 " / 6 cm
Location : Hawsker
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : The ribs of Peronoceras form ventrolateral tubercles or spines. Compressed to square whorl section.

Differential diagnostics : Thinner whorls than P. subarmatum and P. perarmatum, diffentiation from P. turriculatum by tubercles on inner whorls and less dense inner ribs.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.


References : M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978




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Peronoceras turriculatum (SIMPSON 1855)

03102006135826.jpg 

Size : 2.5 " / 7 cm
Location : Hawsker
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : The ribs of Peronoceras form ventrolateral tubercles or spines. Compressed to square whorl section.

Differential diagnostics : Thinner whorls than P. subarmatum and P. perarmatum, diffentiation from P. fibulatum by finer ribs without tubercles on inner whorls up to about 4 cm.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.


References : M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978




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Hildoceras bifrons (BRUGUIƒÆ’¢â‚¬°RE 1789)

03102006162547.jpg 

Size : 3.5" / 9 cm
Location : Whitby 
Age : Upper Lias, bifrons zone, fibulatum Subzone, Alum shales

Diagnostics : Well marked spiral groove in middle of the side of the whorl, venter with strong keel and grooves to the side of it.

Differential diagnostics : More evolute than H. semipolitum, spiral groove in the middle of the side of the whorl even on the inner whorls.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Kettleness, Hawsker, Whitby, Ravenscar.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992

Another 5" / 13 cm Hildoceras with mouth border :

16122008195239.jpg 



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Cleviceras elegans (SOWERBY, 1815)

08102006171351.jpg 

Size : 3.5" / 9 cm
Location : Hawsker 
Age : Upper Lias, falciferum zone, exaratum Subzone, Jet Rock

Diagnostics : Involute, discus shaped ammonite with a strong keel (that easily gets lost...). Sloping umbilical walls, falcoid ribs. Living chamber often compressed.

Differential diagnostics : More involute than C. exaratum, umbilical walls sloping instead of vertical/undercut as in C. exaratum. No spiral groove as in Harpoceras falciferum.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Kettleness, Hawsker, Whitby, Ravenscar.
Relatively rare.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992

Additional pictures :

08102006174030.jpg 
C. elegans multi, size of ammonites 3"

08102006184707.jpg 
C. elegans : Sloping umbilical walls



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Cleviceras exaratum (YOUNG & BIRD, 1828)

08102006181208.jpg 

Size : 1 3/4" / 4.5 cm (Microconch)
Location : Hawsker 
Age : Upper Lias, falciferum zone, exaratum Subzone, Jet Rock

Diagnostics : Medium involute, discus shaped ammonite with a strong keel. Vertical or undercut umbilical walls, falcoid ribs. Living chamber often compressed.

Differential diagnostics : More evolute than C. elegans, umbilical walls vertical/undercut instead of sloping as in C. elegans. No spiral groove as in Harpoceras falciferum.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Kettleness, Hawsker, Whitby, Ravenscar.
Relatively rare.

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992



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Alocolytoceras rugiferum(POMPECKJ, 1896)

19112006184507.jpg 
Collection : Smiffy

Size : 4" / 10 cm
Location : Ravenscar
Age : Upper Lias, thouarsense zone, striatulum subzone, striatulum shales

Diagnostics : The internal mould is completely smooth apart from typical Lytoceras-like constrictions on the inner whorls, which stop at around 3 cm / 1.5". 
If preserved with shell, the shell shows very fine ribbing. Oval whorl section.

Differential diagnostics : Alocolytoceras can easily be mistaken for Lytoceras jurense, from which it is only distinguishable by the constrictions on the inner whorls.

Distribution : In Yorkshire the ammonite can be found at Ravenscar. 
Very rare, especially in large sizes.

References : 
Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992
Rulleau : ƒÆ’¢â‚¬°volution et systƒÆ’‚©matique des Phylloceratidae et des Lytoceratidae du Toarcien et du Dogger infƒÆ’‚©rieur de la rƒÆ’‚©gion Lyonnaise, Lyon 1998




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Peronoceras vortex (SIMPSON 1855)



Size : 2.5" / 7 cm
Location : Hawsker
Age : Upper Lias, bifrons zone, fibulatum subzone, Alum shales

Diagnostics : The ribs of Peronoceras form ventrolateral tubercles or spines. The coronate whorls are depressed.

Differential diagnostics : In the inner whorls of P. vortex there is very little tuberculation. The whorls of P. vortex are generally fatter than the other Peronoceras species, and more evolute.

Distribution : In Yorkshire the ammonite can be found at Port Mulgrave, Hawsker, Whitby / Saltwick, Ravenscar.
The ammonite is quite rare.

Synonyms : Porpoceras vortex (SIMPSON 1855)
                   Ammonites vortex SIMPSON 1855

References : 

M.K. Howarth : The stratigraphy and ammonite fauna of the Upper Lias of Northamptonshire
BMNH London 1978


Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992




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Ovaticeras ovatum (YOUNG & BIRD, 1822)



Size : 6" / 15 cm
Location : Saltwick Bay 
Age : Upper Lias, falciferum zone, falciferum Subzone, Ovatum Band

Diagnostics : Ammonite with elliptical whorl section, strong keel, weak sinuous ribs that fade on the outer whorls, relatively simple suture.

Differential diagnostics : The elliptical whorl section and weak ribbing is disctinctive for this species.

Distribution : In Yorkshire the ammonite can be found at Hawsker, Saltwick Bay, Ravenscar. The ammonite is restricted to the uppermost part of the falciferum subzone, the so-called "ovatum band" and can therefore only be found where & when this particular section is exposed.

Synonyms : Ammonites ovatus YOUNG & BIRD
                   Harpoceras primordiale (SCHLOTHEIM)
                   Harpoceras ovatum (YOUNG & BIRD)
                   Ovaticeras pseudovatum BUCKMAN

References : M.K. Howarth : The ammonite family Hildoceratidae in the lower jurassic of Britain
The Palaeontograpical Society London 1992

Whorl section of Ovaticeras ovatum showing suture lines




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Nodicoeloceras puteolum(SIMPSON, 1855)

03012007180746.jpg 
This superb ammonite resides in Megladon's collection.

Size : 3" / 7.5 cm
Location : Ravenscar
Age : Upper Lias, bifrons - variabilis zone

Diagnostics : Fat, cadicone inner whorls, on outer whorls ribs reduced and with tubercles, smooth venter. The last whorl is reduced in breadth up to the mouth border, very strong mouth border constriction.

Differential diagnostics : Incomplete, not adult specimens difficult to distinguish from other "fat" members of the Dactylioceratinae family.

Distribution : In Yorkshire the ammonite can be found at ? Hawsker, ? Port Mulgrave, Ravenscar. Seems to be rather rare.

Synonyms : Catacoeloceras puteolum

References : 
Schlegelmilch : Die Ammoniten des sƒÆ’‚¼ddeutschen Lias, Stuttgart 1992




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Reply with quote  #22 
Dactylioceras (Orthodactylites) semicelatum (SIMPSON)



Size : 3" / 7.5 cm
Location : Hawsker Bottoms
Age : Upper Lias, tenuicostatum Zone, semicelatum subzone, Grey shales

Diagnostics : Elliptical whorl section, very fine ribbing, about 70-90 primary ribs / whorl at 7 cm. 
The ammonite develops a long drawn, shallow, slightly ribbed constriction before the mouth border at the adult stage.

Differential diagnostics : Whorl section more elliptical and more involute than D. tenuicostatum, but less involute than D. crosbeyi.

Distribution : In Yorkshire the ammonite can be found at Kettleness to Sandsend, Port Mulgrave, Hawsker. 

References : M.K. Howarth : The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast, BM(NH) London 1973



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Reply with quote  #23 
Dactylioceras (Orthodactylites) cf. crosbeyi (SIMPSON, 1843)



Another view to show the depth of the umbilicus :


Size : 3.5" / 9 cm
Location : Hawsker Bottoms
Age : Upper Lias, tenuicostatum Zone, clevelandicum subzone, Grey shales bed 18 only.
It is not totally clear if the secimen shown came from bed 18, thus the ".cf".

Diagnostics : Elliptical whorl section, very fine ribbing, about 80-90 primary ribs on the outer whorl. 
The ammonite develops a long drawn, shallow, slightly ribbed constriction before the mouth border at the adult stage.

Differential diagnostics : Whorl section higher at same diameters and more involute than D. tenuicostatum and D. semicelatum, compressed, coronate inner whorls creating a deeper umbilicus than the other 2 species. Small spines on inner whorls, fewer ribs on inner whorls.

Distribution : In Yorkshire the ammonite can be found at Kettleness, Port Mulgrave, Hawsker. 

References : M.K. Howarth : The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast, BM(NH) London 1973



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Reply with quote  #24 
i have recently found this fossil and would like any info as i am intruiged by it thankyou from whitby

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