What's the plural form of bituminous shale? Here's the word you're looking for.
Answer
The noun bituminous shale can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be bituminous shale.
However, in more specific contexts, the plural form can also be bituminous shales e.g. in reference to various types of bituminous shales
or a collection of bituminous shales.
