Definition

A type of rock that is made up of clay materials and calcium carbonates, similar in composition to marl.

Example

The geologist collected samples of marlstone to study its properties.

Conversation

Have you ever heard of marlstone?

I think I read about it in a geology book once.

It's a really interesting rock, made of clay and calcium carbonate.

Yeah, I remember it mentioned having some unique properties.

Synonyms & Antonyms

Root Explanation

Marlstone is formed from "marl" (from Old English *mearc*, meaning a type of soil or clay) and "stone" (from Old English *stan*, meaning rock or stone). The word refers to a type of rock that contains marl, which is a mixture of clay and lime.

Memory Tip

Think of 'marl' as a special type of soil and 'stone' as rock — together, they describe a rock that contains this unique soil.

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