Here is the distribution map of mt-haplogroup J.
Although it hasn't been found yet in Mesolithic or Palaeolithic Europe, it is possible that J was already in Europe before the Neolithic, especially for J2a1 and J1c, which are rare outside Europe.
Samples have been identified J samples (J1*, J1c and J2b1a) from various Neolithic sites, including Linear Pottery culture (LBK) in Central Europe, the Cardium Pottery culture in southern France, Megalithic cultures in northern Spain, and the Funnelbeaker Culture in Germany and Sweden.
Haplogroup J has been found in Bronze Age samples from the Corded Ware culture (J1c and J2b1a) and Urnfield culture (J1b and J1b1a). The Corded Ware culture is associated with the expansion of Y-haplogroup R1a from the northern Russian steppe, and in light of the continuity with Neolithic samples from Central Europe it can be assumed that J1c and J2b1a maternal lineages were not brought by the newcomers, but absorbed by the male invaders.
The lack of correlation between mtDNA J and Y-DNA R1a is also evident from the facta that mtDNA J has never been found in Bronze Age sites linked that yielded R1a samples in Russia, Central Asia, Siberia or Mongolia. The oldest J sample in North Asia are from the Iron Age Scytho-Siberian Pazyryk culture (6th to 3rd century BCE) and the Iron Age Xiongnu culture, and could have been brought by later migrations from southern Central Asia, notably by the Scythians.
On the other hand, J1b has never been found in Europe before the Bronze Age and was very probably brought by the Indo-Europeans carrying R1b paternal lineages. J1b has also been found among African tribes carrying R1b-V88 lineages, which would presume that J1b was one of the original maternal lineages found in R1b populations at least since the Early Neolithic (see R1b history). The absence of J1b in Bronze Age sites associated with the expansion of the R1a branches of the Indo-Europeans (Balto-Slavic and Indo-Iranian) supports that European J1b is exclusively associated with ancient R1b populations.
UPDATE: check the new Eupedia page dedicated to mt-haplogroup J.

Although it hasn't been found yet in Mesolithic or Palaeolithic Europe, it is possible that J was already in Europe before the Neolithic, especially for J2a1 and J1c, which are rare outside Europe.
Samples have been identified J samples (J1*, J1c and J2b1a) from various Neolithic sites, including Linear Pottery culture (LBK) in Central Europe, the Cardium Pottery culture in southern France, Megalithic cultures in northern Spain, and the Funnelbeaker Culture in Germany and Sweden.
Haplogroup J has been found in Bronze Age samples from the Corded Ware culture (J1c and J2b1a) and Urnfield culture (J1b and J1b1a). The Corded Ware culture is associated with the expansion of Y-haplogroup R1a from the northern Russian steppe, and in light of the continuity with Neolithic samples from Central Europe it can be assumed that J1c and J2b1a maternal lineages were not brought by the newcomers, but absorbed by the male invaders.
The lack of correlation between mtDNA J and Y-DNA R1a is also evident from the facta that mtDNA J has never been found in Bronze Age sites linked that yielded R1a samples in Russia, Central Asia, Siberia or Mongolia. The oldest J sample in North Asia are from the Iron Age Scytho-Siberian Pazyryk culture (6th to 3rd century BCE) and the Iron Age Xiongnu culture, and could have been brought by later migrations from southern Central Asia, notably by the Scythians.
On the other hand, J1b has never been found in Europe before the Bronze Age and was very probably brought by the Indo-Europeans carrying R1b paternal lineages. J1b has also been found among African tribes carrying R1b-V88 lineages, which would presume that J1b was one of the original maternal lineages found in R1b populations at least since the Early Neolithic (see R1b history). The absence of J1b in Bronze Age sites associated with the expansion of the R1a branches of the Indo-Europeans (Balto-Slavic and Indo-Iranian) supports that European J1b is exclusively associated with ancient R1b populations.
UPDATE: check the new Eupedia page dedicated to mt-haplogroup J.
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