The dataset in numbers
Coverage & statistics
A live picture of what the dataset holds and how complete it is — computed from the shipping data on every build. Coverage gaps shown here are genuine (a fact left blank rather than guessed), not errors.
363
geological units
239
registered sources
4,835
field-level citations
1,271
revision notes
480
stratigraphic contacts
173
georeferenced units
Units by era
363 units, coloured by the era colour key used across the site.
Precambrian
47
Paleozoic
97
Mesozoic
109
Cenozoic
96
Quaternary
8
Other
6
Field completeness
Share of the 363 units carrying each field. Every populated fact is source-cited.
Lithology
351 · 97%
Type locality
316 · 87%
Plain-language summary
287 · 79%
Numeric thickness
224 · 62%
Georeferenced
173 · 48%
Fossils
162 · 45%
Economic notes
100 · 28%
Review status: 340 published · 23 under review (provisional, noindexed).
Source verification
Every one of the 239 registered sources is verified — 99% read in full text or a primary compilation; none rests on web metadata alone.
Full text read
233
Primary compilation
3
Reference database
2
Literature search
1
Provenance & relational layer
347 / 363
units citing ≥2 sources (96%)
106
constituent-unit (member) links
4,835
field-level citations (mean 13.3/unit)
480
overlies / underlies contacts (0 dangling)