Geological Mapping · mapping-4-21
Planktonic range chart for LP21
The LP21 range chart should make the inferential chain fully reproducible: specimen identification, published range, selected zonation, overlap interval and final confidence. A zonal conclusion is robust only when multiple diagnostic taxa converge and when the sample’s stratigraphic position is secure.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The LP21 range chart should make the inferential chain fully reproducible: specimen identification, published range, selected zonation, overlap interval and final confidence. A zonal conclusion is robust only when multiple diagnostic taxa converge and when the sample’s stratigraphic position is secure. Long-ranging species add little temporal resolution, while a single short-ranging species may create fragile precision if preservation is poor. Reworked fossils, laboratory cross-contamination and taxonomic synonymy are the principal counter-explanations. The chart is therefore best presented with a sensitivity interval and explicit qualifiers, then cross-checked against LP59 and LP51 so that age relationships obey mapped stratigraphy rather than being adjusted after the fact.
- Source
- Private mapping source vault · geological evidence record
- Location in source
- PDF page 71
- Image quality
- Source scan
- Record ID
- mapping-4-21
