Hadith regarding earth spread over whale

Ma'mar B. Rashid Al-Basri Al-San'ani (95-153) AND Sufyan Al-Thawri Al-Kufi (97-161) <- Sulayman b. Al-Amash Al-Kufi (61-148) <- Al-Husayn b. Jundub "Abu Zubyan" Al-Kufi (d.90) <- Ibn Abbas: ”The first thing that Allah created was the Pen. He said, "Write." It said, "O Lord, what shall I write?" He said, "Write the divine decree." And it wrote all that shall be from that day until the onset of the Hour. Then the Book was folded up and the Pen lifted. The water vapor rose and the heavens split off from it. He then created the Nun, then the earth was spread over it. When the Nun stirred, the earth shook. He created the mountains to secure it, for indeed, they prevail over the earth.“ Then Ibn Abbas recited the verse, {Nun and the Pen and what they write} (Q68:1) through the saying of the Exalted, {You are not, by the favor of your Lord, a madman}. (Q68:2 - Tafsir Abd Al-Razzaq 3/329 I need a clarification of the authenticity of this hadith and an explanation.