superincumbence

英[ˌsjuːpərɪn'kʌmbənt] 美[ˌsuːpərɪn'kʌmbənt]
  • adj.横在上面的;在上面的;自上面的
Adjective:
  1. lying or resting on and exerting pressure on something else;

    "superincumbent layers of dead plants cut off the air and arrested decomposition"