1. plural of coalification; the geological process by which organic material, especially plant matter, is converted into coal through heat, pressure, and time.
Usage: technical; geology

Examples

• The coalifications of ancient forests occurred over millions of years in swampy environments.
• Geologists study coalifications to understand the history of Earth's climate and vegetation.
• Different coalifications in various regions produced coal deposits of varying quality and composition.
• The process of coalifications requires specific conditions of temperature and pressure.
• Scientists examine coalifications to trace the evolution of plant life in prehistoric times.