Psiloceras planorbis – Jurassic – England

Psiloceras planorbis

Hettangian, Lias, Jurassic

Watchet, Somerset, England

 

 This thin-walled ammonite is crushed, as are most of the ammonites found in this locality. Flattening of the specimen has increased the area of iridescence of the shell, which is composed of alternating layers of aragonite and conchiolin or the minerals that have replaced them during fossilization. These not only transmit light but also diffract it, acting as a Rowland prism to divide light into its component parts while reinforcing certain wave lengths, in this case beautiful reds, much as the prisms do in satellites that study the chemical composition of the stars.

Specimen 01

PSILOCERAS PLANORBIS AMMONITE AMMOLITE FOSSIL Fossils

Item number: 290267678511

Winning bid: US $51.00 

Ended: Oct-24-08 19:29:00 PDT

Winning bidder: pepsfossil ( 18)

Seller: fossilfarm-uk

 

Psiloceras Planorbis Ammonite Fossil

Stunning Iridescent triple specimen from Watchet, Somerset

This is one of the most irridescent specimens I have ever come across.

This is a rare and highly desirable fossil. They look somewhat like the Placentaceras Meeki in colour but at a much more realistic price. A large and displayable piece measuring 9″ x 8.3″, solid and professionally prepped here at the fossil farm. My personal favourite of all the British Ammonites available at any money…

 

 

Specimen 02

PSILOCERAS PLANORBIS AMMONITE AMMOLITE FOSSIL Fossils

Item number: 290278059609

Winning bid: US $32.05 

Ended: Dec-05-08 19:22:00 PST

Winning bidder: .***y ( 441)

Seller: fossilfarm-uk

 

Psiloceras Planorbis Ammonite

 This is a rare and highly desirable fossil. They look somewhat like the Placentaceras Meeki in colour but at a much more realistic price. This piece measures 7.2″ x 6″ x 1″, solid and professionally prepped here at the fossil farm. My personal favourite of all the British Ammonites available at any money..

Specimen 03

PSILOCERAS PLANORBIS AMMONITE AMMOLITE FOSSIL Fossils

The Best display fossil EVER **NR** The fossil farm

Item number: 290287477562

Winning bid: US $94.00 

Ended: Jan-16-09 19:31:00 PST

Winning bidder: i***n (574)

Seller: fossilfarm-uk (2391) – The Fossil Farm

Psiloceras Planorbis Ammonite

This is a rare and highly desirable fossil. They look somewhat like the Placentaceras Meeki in colour but at a much more realistic price. This piece measures 9″ x 7.2″ x 0.6″, solid and professionally prepped here at the fossil farm. My personal favourite of all the British Ammonites available at any money. A rare multi assemblage.

 

 

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