Origin of Lineages of ancient Celts
Y-DNA Sankey Graphs showing the Evolution from the Beaker Culture to the Hallstatt Culture to the Laténe Celts of Antiquity.

Hallstatts Y-DNA is differentiated from the Beaker period primarily by a large amount of G2a, specifically L497, while in the Laténe period R1b-P312 becomes bigger again.

43.5% of Hallstatt Lineages trace back to the Beaker culture, and 87.4% of Laténe lineages trace back to Hallstatt.

First Chart uses a Clade Depth of 12, Second chart 10