Broinsonia ethmoquadrata

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: axial cross and fine grill

Taxonomy:

Farinacci & Howe catalog pages: B. ethmoquadrata * , B. staytonae *

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: axial cross and fine grill

Morphology:

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Original description - so real range may be longer
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Original description - so real range may be longer

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Broinsonia

Broinsonia ethmoquadrata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-10-2022 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10122 Go to Archive.is to create a permanent copy of this page - citation notes

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