a dark coarse-grained sandstone containing more than 15 per cent clay
a 120-foot pyramid of battered greywacke a quarter mile offshore
the shales and greywackes of the Skiddaw Group

Connections NYT: Hints For Today's Puzzle, Tue, Jan 13

NYT Strands Today - Hints, Spangram & Answers for January 13

Today’s Wordle Answer Jan 13 #1669- NYT Wordle Hints & Updates

Today's NYT Pips Hints & Answers

Today's NYT Capture Hints & Answers

NYT Mini Crossword Answers Today - The Mini for Jan 13 Solved

Connections NYT: Hints For Today's Puzzle, Tue, Jan 13

NYT Strands Today - Hints, Spangram & Answers for January 13

Today’s Wordle Answer Jan 13 #1669- NYT Wordle Hints & Updates

Today's NYT Pips Hints & Answers

Today's NYT Capture Hints & Answers

NYT Mini Crossword Answers Today - The Mini for Jan 13 Solved