Late Miocene onset of the modern Antarctic Circumpolar Current

evidence

The timing of ACC onset is contested: this paper places the modern ACC in the late Miocene, while other studies place onset near the Eocene–Oligocene transition (~34 Ma), at ~31 Ma from foraminiferal and neodymium evidence, at ~30 Ma from Tasmanian gateway–westerly alignment, and at ~24 Ma from flow-speed and water-mass homogeneity records. The disagreement is stated, not resolved; none of the papers was fetched.

A evidence is not a place. Drawing it on a map would assert something about the world that no stored fact supports.

Evidence · 0

This object cites no evidence.

Timeline

No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.

Connections · 0

Assembled narrative · 0

This object does not clear the publishing floor: an assembled narrative needs a description and at least one cited piece of evidence.

Observed changes · 0

No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.

Actions

Read the assembled narrativeThis object has no public Experience: one needs a description and at least one cited piece of evidence.Continue in StudioOpen TwinTwin does not start a decision from this kind of object.ShareSaveSaved objects are part of the authenticated projection, which is declared and not yet built.

/atlas?object=EVIDENCE_EV_ACC_ONSET_DEBATE