pillar - PNC
- placodont
- placodontids
- placolith
- placosyncline
- pladdy
- pladorit
- plaffeiite
- plage
- plaggen
- plaggept
- plagiaplite
- plagiobasalt
- plagioclase
- plagioclase arenite
- plagioclasite
- plagioclastic
- plagiogranit
- plagiogranite
- plagioliparite
- plagionite
- plagiophyre
- plagiosaurids
- plagiostome
- plagiotetraenes
- plagiotriaenes
- plaice
- plain
- plain bonito
- plain concrete
- plain flood
- plain of abrasion
- plain of marine denudation
- plain of subaerial denudation
- plain of submergence
- plain of transgression
- plain type of fold
- plainland
- Plaisancian
- Plaisancian stage
- plaiting