[Ferox13]

Originally Posted by neverending

Though Machen and Blackwood are great writers, which I admire myself, the OP didn't ask for examples of atmosphere. Also, perusing Lovecraft's essay will not yeild the type of material the poster asked for. Though Lovecraft keenly analyzed the supernatural tale, and admired the form, it isn't what he wrote, with few exceptions, and it isn't what the poster is looking for. He asked for examples of "great unknowable terror" or what has come to be referred to as "cosmic horror."

It wasn't until Lovecraft himself that this concept was fully developed, though traces of it can be seen in Robert W. Chambers, an author that did specifically inspire Lovecraft. A couple of Lovecraft's contemporaries, Clark Ashton Smith and Frank Belknap Long also excelled in this type of tale. In particular, Long's story "The Hounds of Tindalos" is notable.

For more modern examples od cosmic terror, there is Willum Hopfrog Pugmire, who I mentioned previously, Joe Pulver, Brian Lumley, and many others. Look up the Lovecraft EZine online for hours of fascinating reading in the tradition of Lovecraft.

Do you not think a lot of elements from The Great God Pan can be seen in some of Lovecraft's work.

You can also add Robert E. Howard/Robert Bloch to the list of Mythos writers.