Middle Aalenian subage

174.7 - 170.9 Ma

The definition of this interval in the timescale Mesozoic Subages is taken from the following source:

  • F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view

There are intervals in 7 timescales which overlap this one. show

This interval is used in the definition of 96 collections

A total of 1616 collections with 7448 occurrences lie within this time span

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International Chronostratigraphic TimescaleMesozoic Subages
JurassicLate JurassicTithonianLate TithonianMiddle Tithonian143.1
Early Tithonian145.06 *
KimmeridgianLate Kimmeridgian149.2
Early Kimmeridgian152.21 *
OxfordianLate OxfordianMiddle Oxfordian/Early Oxfordian154.8
157.9 *
Middle JurassicCallovianLate Callovian/Middle Callovian/Early Callovian161.5
BathonianLate Bathonian/Middle Bathonian/Early Bathonian165.3
BajocianLate Bajocian168.2
Early Bajocian168.6 *
AalenianLate Aalenian/Middle Aalenian/Early Aalenian170.9
Early JurassicToarcianLate Toarcian174.7
Middle Toarcian180.4 *
Early Toarcian182.9 *
PliensbachianLate Pliensbachian/Early Pliensbachian184.2
SinemurianLate Sinemurian/Early Sinemurian192.9
HettangianLate Hettangian/Middle Hettangian/Early Hettangian199.5
201.4