The small shallow hollows in rocks produced by wind deflation are called blowouts.

Here's why:

* Deflation: This is the process of wind erosion where it picks up and carries away loose particles, like sand and dust.

* Blowouts: These are depressions or hollows in the ground created by deflation. They can vary in size but are typically shallow and bowl-shaped.

Blowouts are often found in deserts and other arid regions where wind is strong and there is little vegetation to hold the ground together.