Stratum:
In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock that was formed at the Earth’s surface,[1] with internally consistent characteristics that distinguish it from other layers. The “stratum” is the fundamental unit in a stratigraphic column and forms the basis of the study of stratigraphy. A stratum can be seen in almost every single country in the world. [Wikipedia]
Noted in “With a resounding victory, Democrats can protect us from the next Trump,” Jennifer Rubin, WaPo:
The goal of a new administration and Congress must be to restore democratic (small “d”) legitimacy and secure its future so that the United States — as it is now, and as it will be in future generations, in all its racial, ethnic and religious diversity — is not deprived of the opportunity for self-government. The range of reforms is vast, from voting and court reform to increasing the size of the House of Representatives to depoliticization of the Justice Department to increasing financial transparency for officeholders and the criminal penalties on receipt of foreign election assistance. The goal is simple: Never again should a thin stratum of hateful Americans be able to game the system and threaten the basic tenets of democracy.