Why are the most ancient eras not divided into geological periods?

Each era was separated from another by some event, be it the Cambrian explosion or the ice age. In the earliest geological eras, the planet was just forming and there were no significant events: everything happened gradually.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.