Basalts erupted and rapidly chilled under water form rounded lumps called "pillows". Pillow-lavas are cemented by a light-grey fossiliferous limestone.
![](local/cache-vignettes/L1920xH1032/4891d34c8870cc18446dc32239a3ba-b0200.jpg?1688243095)
Basalts erupted and rapidly chilled under water form rounded lumps called "pillows". Pillow-lavas are cemented by a light-grey fossiliferous limestone.