Porte broke down in tears as he realized the enormity of the loss.
He crashed out in dramatic fashion during a mountain descent in 2017 at the same stage.
Dylan Groenewegen snatched his second win in a row on the Tour de France when he prevailed in awe-inspiring fashion in a bunch sprint at the end of the eighth stage on Saturday.
Tony Martin (Katusha-Alpecin), a victor of the last cobbles stage in 2015, did not start following a crash Saturday.
"No one could have imagined this is the way Stage 9 would have started but we still have 7 riders in the race and we are behind them 100% of the way".
The Australian was well-placed at 10th overall, 57 seconds behind race leader and Belgian teammate Greg van Avermaet.
Sunday's stage involves 22km of cobblestones and Porte's crash came before any of the uneven sectors.
Porte came into this year's Tour in solid form and had looked strong through the first week.
Porte, 33, was spotted clutching his right clavicle as riders tried to untangle themselves from bikes and bodies.
Porte showed he was ready for this year's Tour by winning the Tour de Suisse last month, probably the biggest title of his career.
It appeared that Porte might have broken a clavicle, but there was not an official diagnosis.
This year's Tour has been a slow burner so far, but that's about to change. Photographers and TV cameramen hovered close to snap some images of one of the first major pre-Tour favorite forced to abandon.
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