Note: EE does not come with any pre-configured strata, and therefore creation of strata should be completely done by the modpack developer from scratch.
Locate the emendatusenigmatica\strata config folder inside the root config folder.
Create a *.json file inside this folder for each strata you wish to add to the game.
Below you will find a more detailed break down of the Strata Data object, and a brief explanation of each data field. An example of a complete strata file can be found here.
Strata Core module:
REQUIRED FIELD
"id": string // example: "id": "granite"
Used for all registry naming conventions, and should be a unique identifier for each strata.