I am looking for a children’s picture book  that I am 90% sure was published before 1990. It follows a group of explorers through a cave. Page after page there are different looking creatures staring at them from behind rocks and on the stalagmites on the ceiling as they pass through the cavern. Some of the creatures sort of look like the ones from Where the Wild Things Are, or in the same spirit of Mercer mayor’s monsters. I have looked at both their respective catalogs and can’t kind a book that fits this description. I am pretty sure it is a rectangular shaped book. This one has stumped me for years and I really want to find it. Appreciate the help