It is the chief ingredient of sand, sandstone, quartzite, chert, diatomaceous earth, and tripoli.
"The Economic Aspect of Geology" by C. K. Leith
Diatomaceous earth exists at several places in Yezo.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 2" by Various
Diatomaceous earth is most effective on pests that are under constant moisture stress, which is the typical life situation of most house spiders and insects that wander in from outdoors.
If controlling flies around your chickens is an issue, you can use diatomaceous earth to tame the population.