MIDS Element - 10. GeologicalAge

[emhaston]

Information Element	GeologicalAge
Modified	2023/12/14
Label	Geological Age
Definition	Refers to the geological age of a Earth Science specimen (i.e. Fossil, Rock, Mineral or Meteorite) and can be any kind of stratigraphic age, isotopically determined age or structural age.
Purpose	To provide information about the age of the geological, mineralogical, fossil or meteorite specimen.
Applicable standard(s)/recommendation(s)	It is recommended follow the International Commission on Stratigraphy chart, and that litho- and biostratigraphy, where available, should also be provided.
Examples	To be added
Required	Yes (Geology & Palaeontology)
Constraints
Element specification status	agreed; accepted in specification
Notes	none

[PipBrewer]

MIDS level 2, I would say chronostratigraphy (from and to i.e., Miocene to Pliocene) should be mandatory for palaeontological objects and to the most granular level available.

Minimum of one of these:
dwc:earliestAgeOrLowestStage
dwc:earliestEpochOrLowestSeries
dwc:earliestEraOrLowestErathem
dwc:earliestPeriodOrLowestSystem

and one of these:
dwc:latestAgeOrHighestStage
dwc:latestEpochOrHighestSeries
dwc:latestEraOrHighestErathem
dwc:latestPeriodOrHighestSystem

Recommended that aligns with International Commission on Stratigraphy chart

Recommended that litho- and biostratigraphy, where available, should also be provided

[emhaston]

This needs input from the Geological and Palaeontological community.

[smrgeoinfo]

For the sample location stratigraphic context, need to distinguish lithostratigraphy (correlation of rock bodies base on similar lithology and lithology of overlying and underlying units), biostratigraphy (correlation of rock bodies base on similar fossil assemblages), and chronostratigraphy (correlation based on known or inferred depositional age). All of these are subject to various caveats and exceptions

[PipBrewer]

I would propose that chronostratigraphy is essential at MIDS 2 level for palaeontological specimens and that including lithostratigraphy and/or biostratigraphy is highly recommended (but not essential) at this level

[PipBrewer]

In my first comment on 29th September 2022, I forgot the following 2 terms as part of core terms for mids2:

dwc: earliestEonOrLowestEonothem
dwc: latestEonOrHighestEonothem

[PipBrewer]

I would suggest definition to be: Terms denoting the names of strata and/or their age from which a specimen is derived

I would suggest purpose to be: To provide geological context to the specimen

[emhaston]

From meeting on 13 July 2023:
Proposal to replace Stratigraphy with GeologicalAge
Would map to DWC GeologicalContext terms https://dwc.tdwg.org/terms/#geologicalcontext
Would map to ABCDEFG terms (Rachel can help provide these & Sam has also done some work here)
How will it map to Latimer Core?

Term name updated