Promicroceras marstonense
Vendor: Fossil Soup
SKU Number: SQ6428465
Large Promicroceras marstonese “Marston Marble" ammonite cluster from the Lower Jurassic rocks of Somerset, England. This rock is often referred to as “Marston marble” due to its decorative look. This piece is from the 200 million year old early Jurassic (Lower Lias) age Obtusum zone.
The ammonites have undergone mineralization and the original shell has been replaced by calcite during fossilization. The ammonites are fully 3 dimensional with well defined rib ornamentation. An acrylic stand is included.
Full dimensions are listed below (dimensions given are for the largest ammonite)
Vendor: Fossil Soup
SKU Number: SQ6428465
Large Promicroceras marstonese “Marston Marble" ammonite cluster from the Lower Jurassic rocks of Somerset, England. This rock is often referred to as “Marston marble” due to its decorative look. This piece is from the 200 million year old early Jurassic (Lower Lias) age Obtusum zone.
The ammonites have undergone mineralization and the original shell has been replaced by calcite during fossilization. The ammonites are fully 3 dimensional with well defined rib ornamentation. An acrylic stand is included.
Full dimensions are listed below (dimensions given are for the largest ammonite)
Vendor: Fossil Soup
SKU Number: SQ6428465
Large Promicroceras marstonese “Marston Marble" ammonite cluster from the Lower Jurassic rocks of Somerset, England. This rock is often referred to as “Marston marble” due to its decorative look. This piece is from the 200 million year old early Jurassic (Lower Lias) age Obtusum zone.
The ammonites have undergone mineralization and the original shell has been replaced by calcite during fossilization. The ammonites are fully 3 dimensional with well defined rib ornamentation. An acrylic stand is included.
Full dimensions are listed below (dimensions given are for the largest ammonite)
Additional Information
Ammonites are a group of extinct marine mollusks that occupy the same class that includes octopuses, squids, and nautiluses.
The group Cephalopoda is divided into three subgroups: coleoids (including squids, octopuses and cuttlefishes), nautiloids (the nautiluses) and ammonites.
During their long history, ammonites survived three mass extinctions—most notably the Permian extinction, a global warming that was brought on by volcanic activity about 252 million years ago, and that killed 96 percent of the planet’s marine species. While many species of ammonites died out in that extinction event, scientists believe the survivors diversified explosively in the million years that followed. Ammonites hunted the planet’s seas until they were entirely wiped out by the same cataclysm that claimed the non-avian dinosaurs about 66 million years ago.
References:
Promicroceras
Order Ammonoidea
National Geographic Ammonte Facts
