Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ha Long Bay' has mentioned 'Pleistocene' in the following places:

Occurrence Sentence	Text Source
Some marine notch caves had been not formed at present sea level, but old sea levels related to sea level changes in Holocene transgression, event to Pleistocene sea levels.	WIKI
The continuation of this erosion has progressively cut the highlands into blocks with altitudes similar to today's mountains 26,000,000xe2x80x9310,000,000 BC Neogene Period The development of the Ha Long depression 2,000,000xe2x80x939000 BC Pleistocene epoch of the Quaternary period The process of erosion began dissolving the limestone-rich region of Ha Long, after that, forming the limestone plain was most active 68,000xe2x80x939000 BC middle and late Pleistocene Epoch Period when the caves and grottoes of the area formed.	WIKI

Occurrence Sentence

Text Source

Some marine notch caves had been not formed at present sea level, but old sea levels related to sea level changes in Holocene transgression, event to Pleistocene sea levels.

WIKI

The continuation of this erosion has progressively cut the highlands into blocks with altitudes similar to today's mountains 26,000,000xe2x80x9310,000,000 BC Neogene Period The development of the Ha Long depression 2,000,000xe2x80x939000 BC Pleistocene epoch of the Quaternary period The process of erosion began dissolving the limestone-rich region of Ha Long, after that, forming the limestone plain was most active 68,000xe2x80x939000 BC middle and late Pleistocene Epoch Period when the caves and grottoes of the area formed.

WIKI