erron. spellings of CAUK.

1

1815.  Annals of Agric., XIX. 476 (E. D. S.). An imperfect chalk marl, or a cork, that is, a hard chalk.

2

1846.  Jrnl. R. Agric. Soc., VII. II. 450. The lower beds of hard chalk, provincially called corlk.

3