He is an expert in paleobotany.

He is an expert in paleobotany, conducting research on plants from the dinosaur era.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.

Paleogeography is a study that researches the past geographical conditions of the Earth.

He has a deep interest in paleozoology.

He is an expert in paleoecology, pouring his passion into studying past ecosystems.

He is writing a thesis on paleogeography.

I have been to Kikonai.

He is immersed in the study of ancient seal script.