Assertion: delta's sediment | /r/HasProperty | divided
Facets:
value: further
type: MANNER
value: tentatively
type: DEGREE
Source sentences:
text: Fan sediments were tentatively further divided into: (a) matrix-rich diamicton that appears predominant at the core of the fan and at lower stratigraphic horizons, suggesting bouldery rock-slide or debris flow origin, and (b) horizontally-bedded sheetflood sand and gravel dominating the upper 20--25 m of the stratigraphic column.