Penalty enforcement

[AKvbfb]

Situation: 3rd and 4 on the 7 yard line. Running back is tackled by a facemask at the 2 yard line. After the ball is dead, there is a dead ball unsportsmanlike penalty on the running back. So, we have a live ball, dead ball situation. The facemask penalty puts the ball at the 1 yard line, dead ball foul moves the ball back to the 16 yard line.

My question is it 1st and goal at the 16 yard line or 1st and 10 at the 16 yard line?
Another official said that it should be 1st and 10 at the 16 yard line, but couldn't site the rule. Can anybody help me with where I would find this rule for this enforcement?