[
Moron, this is the latest tree with the most up to date TMRCA's:
https://yfull.com/tree/
https://yfull.com/tree/A1b1/
Ethiopian A formed in the Paleolithic (over 40,000 years ago). It's not Khoisan.
Haplogroup "A" in Africa.
https://en.wikipedia.org/wiki/Haplogroup_A_(Y-DNA)
The items on the chart I gave above were all M- subgroups of "A".
https://en.wikipedia.org/wiki/Haplogroup_A_(Y-DNA)#A-M31
"In
Ethiopia, one study has reported finding haplogroup A-M13 in 14.6% (7/48) of a sample of
Amhara and 10.3% (8/78) of a sample of
Oromo.
[22] Another study has reported finding haplogroup A3b2b-M118 in 6.8% (6/88) and haplogroup A3b2*-M13(xA3b2a-M171, A3b2b-M118) in 5.7% (5/88) of a mixed sample of Ethiopians, amounting to a total of 12.5% (11/88) A3b2-M13.
[18]"
https://en.wikipedia.org/wiki/Haplogroup_A_(Y-DNA)
"The clade achieves its highest modern frequencies in the
Bushmen hunter-gatherer populations of
Southern Africa, followed closely by many
Nilotic groups in
Eastern Africa. However, haplogroup A's oldest sub-clades are exclusively found in
Central-
Northwest Africa, where it (and by extension the
patrilinear ancestor of modern humans) is believed to have originated. Estimates of its time depth have varied greatly, at either close to 190 kya or close to 140 kya in separate 2013 studies,
[5][8] and with the inclusion of the previously unknown "A00" haplogroup to about 270 kya in 2015 studies.
[9][10] The clade has also been observed at notable frequencies in certain populations in
Ethiopia, as well as some
Pygmy groups in Central Africa, and less commonly
Niger–Congo speakers, who largely belong to the
E1b1a clade.
Haplogroup E in general is believed to have originated in Northeast Africa,
[11]