Martin came down just 800m from the line, meaning he was given the same time as the lead group and thus kept his yellow jersey, but it is now unlikely he will be on the start line for stage seven.
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Chris Froome and Vincenzo Nibali also went down in the crash, with some verbal sparring resulting in the Team Sky rider boarding the Astana bus after the stage to talk it through.
Earlier in the stage MTN-Qhubeka’s Daniel Teklehaimanot realised a lifelong dream and claimed a massive piece of Tour de France history by becoming the first African to wear the polka dot jersey.
The Eritrean, the first black African to ride the Tour, got out in the day’s breakaway and swept up all three mountains points on offer to leapfrog incumbent wearer Joaquim Rodriguez.