ammonite znaczenie & definicja

Przykłady ammonite

• This siltstone unit lies upon a conspicuous erosion surface highlighted by angular chips of phosphatized pebbles and ammonites.

• The central part begins with ammonite-bearing crinoidal limestones and black pillow basalts.

• Cladistic techniques have been applied to many fossil groups but ammonites remain largely understudied in this way.

• Detailed collecting through 15 sections across the basin has facilitated a major revision of the ammonite zonation.

• The fauna is limited to ammonites and a species of epifaunal bivalve.

• This method can therefore be used to compare the morphological signal of ammonites with other physical or chemical signals.

• We note, however, that ammonites have not been recorded from the 1.8 m of strata below the proposed boundary level.

• The sudden appearance of these genera represents a major reinvasion of the basin by neocomitid ammonites.