Ammonites:
Frechites nevadanus, Parafrechites meeki, Paraceratites vogdesi, Nevadites
furlongi
Phylum
Mollusca, Class Cephalopoda, Subclass
Ammonoidea, Order Ammonitida
Geological
Time: Triassic
Size (25.4mm=1
inch): Matrix 4 1/4" X 6 3/4" (110mm X 170mm) F. nevadanus 1
1/16" "A" , Largest P. meeki 1 1/4" "B"
, P. vogdesi 2" ( 51mm) "C" , N. furlongi 13/16" (21mm)
"D"
Fossil Site:
Favrett Formation, Pershing County, Nevada
| These
Triassic ammonites coming from Nevada likely swam the seas with
the first Ichthyosaurs (large sea going reptiles that looked like
dolphins), for which they were probably a major food source. This
was also a time when the various continents of moderns times comprised
a single landmass called Pangaea.
This
particular plate contained four different species. They are found
in a very hard limestone and are very difficult to prepare, which
is why they are rarely seen on the market.
Also see: Ammonite
Fossils
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