PTBA Internship Report · internship-4-u33
A1–A2 interburden
The A1–A2 interburden is described as fine, locally tuffaceous sandstone with subordinate finer beds. Volcanic input may aid recognition, but a tuffaceous appearance is not automatically an isochron unless petrography or geochemistry demonstrates a correlatable event bed.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The A1–A2 interburden is described as fine, locally tuffaceous sandstone with subordinate finer beds. Volcanic input may aid recognition, but a tuffaceous appearance is not automatically an isochron unless petrography or geochemistry demonstrates a correlatable event bed. The internship core panel should be read from top to base, keeping contacts, grain-size shifts, structures and recovery gaps visible instead of compressing the interval into a single label. It becomes a useful marker only where neighbouring wells repeat both the facies order and the corresponding log response; visual resemblance alone does not establish time equivalence. Its later thesis counterpart is the same evidence carried forward, not an independent repeat sample.
- Source
- Private internship source vault · Chapter IV record
- Location in source
- 4.4.6 Seam A1
- Image quality
- Standard
- Record ID
- internship-4-u33
