Moscon had been a key figure in Sky's successful start to the tour.
Moscon, 24, was confirmed to have been expelled after this morning's stage had finished, deemed to have breached article 12.1040.30.1 of UCI regulations, covering "acts of violence among riders" and allows for disqualification in the event of "particular serious aggression".
Italy's Gianni Moscon is out of the Tour after he was found to have hit a fellow rider.
Team Sky manager Dave Brailsford and sports director Nicolas Portal visited the race jury after the stage finish in Carcassonne to review the television footage and plead Moscon's case, however this came to no avail, with the rider being ejected yesterday evening.
"I would like to offer my honest apologies to both Elie Gesbert and Team Fortuneo Samsic for this unacceptable incident". The race itself was won by Magnus Cort Nielsen while Geraint Thomas maintained the yellow jersey.
Race officials took the decision after Moscon was involved in a fracas with a rider from the Fortuneo team shortly after the stage start in Millau. Sky have been booed by spectators all their way around France during this Tour.
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While Brailsford has stated the team will "address this incident with Gianni once the Tour is complete, and decide then if any further action should be taken", the fact that Moscon has been at the centre of so many previous disciplinary concerns raises the question of how many lives the Italian has left.
In 2017 he was suspended for six weeks and sent on a diversity awareness course after racially abusing Reza during the Tour de Romandie, while in June this year he was cleared of deliberately causing a crash with Reza's team-mate Sebastien Reichenbach - an incident which was alleged to be related.
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In September Moscon was also ejected from the UCI road world championships after video emerged of him taking a tow from a team auto.
The irony is that Thomas had just been saying how nice it was to have a day in which he did not have to "fight", with Team Sky controlling the bunch behind the day's breakaway.