Code
XXT
Status
Informal.
Lithological description
Fine-grained, often grey particles, often compacted after deposition into more or less solid rock. Diagentic alteration may have occurred.
Depositional setting
Rock made of volcanic ash ejected from a vent during a volcanic eruption.
Definition of lower boundary
Sharp to diffuse.
Definition of upper boundary
Sharp to diffuse.
Thickness indication
Up to several meters.
Geographical distribution
N/A
Regional correlation
N/A
Age
Devonian - Holocene.
Type section
Well:
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Origin of name
None.
Previous name(s)
None. This is a new unit.
Reviewed by (date)
Geert-Jan Vis (2020).
References
Van Bergen, M.J., Sissingh, W. 2007. Magmatism in the Netherlands: expression of the north-west European rifting history. In: Geology of the Netherlands. Eds: Wong, Th.E., Batjes, D.A.J., De Jager, J., Royal Netherlands Academy of Arts and Sciences, 197–221.
Cite as
TNO-GDN ([YEAR]). Tuff or ash. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/tuff-or-ash.