Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Wadi Al-Hitan (Whale Valley)' has mentioned 'Mangrove' in the following places:

Occurrence Sentence	Text Source
The monotony of these sandstones is broken by a white layer full of well-preserved animal burrows (previously thought to be mangrove roots) and a layer of black mudstone above that.	WIKI