Qur'an Contradiction:

Heaven or Earth, which was created first?

He it is Who hath created for you all that is on earth.
Then He turned to the heaven, and made them into seven heavens. -- Sura 2:29

Sura 41:9-12 also gives details on the creation process and confirms that the earth was created first and then the heavens. But then we read also:

Are you the harder to create, or is the heaven that He built?
He raised the height thereof and ordered it;
and He has made dark the night thereof, and He brought forth the morn thereof.
And after that, He spread out the earth. -- Sura 79:27-30

[A Muslim Response]

Further detailed discussion of this issue:

Contradictions in the Qur'an
Answering Islam Home Page