That's odd. Earlier today there were no Excel files in the Supporting Information. Now they show up. I can finally find answers to y questions.
1) Regarding E1b samples, there are:
- 4 of the E1b1b samples are from the Michelsberg culture in Alsace.
- one E1b1
a1a1a1c2c (CTS3274) sample (PSS282) from Pont-sur-Seine (between Paris and Troyes). That one is highly surprising as it is normally found in places like Senegal and North Africa.
- one E1b1b from Le Cailar (between Montpellier and Nîmes) dating from the second Iron Age (La Tène culture).
2) Here are the I1 samples:
a) a Middle Neolithic I1 sample, Cugnaux near Toulouse in SW France dated 5300 ybp. This sample is
I1-FGC3466 (aka S5619), which according to Yfull was formed 4600 ybp and has a TMRCA of 3800 ybp. It is a rare branch of I1a2-Z58>Z138 found in Western Europe.
b) an Early Bronze Age
I1-Y6885, downstream of I1a2-Z58>Z60>Z140>A196>Y6900. This branch is found apparently only in Britain and Ireland today. Yfull gives a age of 3200 ybp and TMRCA of 1050 ybp. The archeological sample is dated 3490 ybp, so slightly older.
c) an I1 (no subclade provided) from Bessan (between Montpellier and Narbonne) from the second Iron Age (La Tène culture).
d) Excel file #11 also lists another I1 (GOX287) but it is not listed elsewhere, so I don't know the location and age.
Conclusion regarding I1 : both ancient French samples are older than current age estimates for those clades. It is the first compelling evidence that some I1 branches are not of Scandinavian/Germanic origin.
3) Figure S3-2 in the OP appears incorrect. It showed several C1a2 samples from the Bronze Age, but none are listed in the Excel file. There is only one C1a2 sample from Neolithic Alsace.