The Boonton Formation rests conformably above the Hook Mountain Basalt , placing its deposition sometime between approximately 197 and 190 million years ago during the late Hettangian stage and Sinemurian stage of the Jurassic .
Head entity: sinemurian Q911869 29
Tail entity: hettangian Q633834 26
Relation (head \u2192 tail): P155
Inverse relation (tail \u2192 head): P156