Student or Learner
Steadily though, as if he were leaving the haven of some second childhood, even these reference points seemed to be withdrawn from him, to be replaced by a rushing chaos, the sense of an act of memory continually performed without relief, a hidden river in the night, from which might sometimes surface unbidden some fragment of an event drifting like a dead branch amid the unidentifiable rubbish of the tides. . . .
(Viriconium; M. John Harrison)
Would you be so kind as to tell me whether it should be read as 'the sense of an act of memory being continually performed without relief'?
Yes. The "being" is usually omitted but understood as if present.