Use of Adjectives

Question

What is the correct spelling of this phrase? Should it be "un vieux parchemin extrêmement"?    un extrêmement vieux parchemin.

Cécile Janty-Davies · Accepted Answer

Dear Bruce, 
On reflection, I have decided to alter my response -
You cannot say your first suggestion because the adverb has to be next to the adjective vieux 
un extrêmement vieux parchemin 
is actually an anglicism and wouldn't be said in France 
So -
un parchemin extrêmement vieux
is the only possibility using the adverb extrêment as explained in point 5 of the lesson.
Hope this helps!

Bruce Aboudara · Answer

Based on that why is this incorrect? Isn't etonnamment an adverb which would proceed an adjective? I am sure the grading is correct but I must not know my articles very well!un étonnamment bon film