Ammonite fossil found near Whitby, North Yorkshire on the Jurassic coast
Fibulation (looped ribs) combined with spines is usually a particular feature of most Peronoceras species; although fibulation is usually absent in P.perarmatum. In Yorkshire there are the more compressed (slender) finer-ribbed P. turriculatum and P. fibulatum (the former having less looped ribs on inner whorls), and then the depressed (thicker) coarser-ribbed P. subarmatum and P.permaratum (the latter usually possessing no looped ribs). To add to the confusion there are also many intermediary forms. On all these species the ribs bend forward over the top, but more notably on the 2 former more slender species. Spines are usually much more robust on the thicker 2 latter species.
Actual ammonite size: 7.3cm
Age (lithology): Upper Lias; Toarcian; Bifrons zone; Fibulatum subzone.
Distribution: Staithes, Port Mulgrave, Runswick, Kettleness, Sandsend, Hawsker, Ravenscar.
Occurrence: Common (but much less so P.permaratum)
Worldwide Shipping Available - We Offer Both Domestic And International Shipping, Including To USA and EU.
- All international shipments may be subject to customs duties, taxes, and clearance fees, which are not included in the product or shipping cost.
- These charges are set by your country’s customs authorities and must be paid by the buyer.
Authenticity
All of our available specimens are collected and sourced by ourselves or local trusted collectors and we can guarantee the fossil you will receive is 100% genuine. You will be made aware of fossils with any restoration in the description of the fossil.
Safe payment on our website