Jira can largely be classified as a Science Fantasy world but because of the scale of the Jira project it's more accurate to categorize the different eras of Jira into different genres. For now they are as follows:
Prehistory - Speculative Biology
Surface era - Medieval Fantasy
Dispace era - Underground Fantasy
Early Island era - Fantasy
Era of science - Steampunk
Modern Era - Modern Contemporary
Cyber era - Scifi
Post Cyber era - Eco Scifi