Some are bituminous (6 letters) — Crossword Helper

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The Clue

Some are bituminous (6 letter answer)

The Answer

SHALES

Tags

are bituminou fissile fuel layered oil producing rock shale some source synthetic terrigenou

Notes

The answer SHALES is rarely seen, appearing only about once every 2400 puzzles.

Related Clues

Fissile rocks
Layered rocks
Terrigenous rocks
Oil-producing rocks
Synthetic fuel sources

Definition

SHALE as a noun:

1. a sedimentary rock formed by the deposition of successive layers of clay