Rav Gedaliah Nadel was a fascinating figure. He was one of the foremost talmidim of the Chazon Ish, and lived underneath from Rav Chaim Kanievsky in Bnei Brak. On the other hand, he believed that the world was billions of years old, accepted evolution, held that Chazal were fallible and science, and that the mabul did not cover the entire world. I had a memorable meeting with him before he passed away.
After his passing, Rav Yitzchak Shilat published a compilation of his teachings, entitled B'Toraso Shel Rav Gedaliah, which was promptly placed in cherem. Of course, they couldn't claim that Rav Gedaliah had heretical views, because he was too big, so instead they claimed that the book misrepresents his views. (It was prepared by one of his main talmidim, from audio recordings, and from my own meeting with him I can confirm that he held these views.)
I was please to see that the incredible website www.hebrewbooks.org now has this work available for free download. Furthermore, it is possible to copy-and-paste text from the PDF file. Baruch Hashem for the Information Age!