With decreasing of peat granule size, the content of TN and TP was increasing obviously in peat sediment of river bed-flood land and valley depression land.

河床-河漫滩型和谷底洼地型泥炭沉积物中总氮和总磷含量随着泥炭粒级的减小而明显增加。

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Mr Thomas discovered the tusk when he was showing his brother Mark where he found a set of prehistoric human footprints in a peat bed a few weeks ago.

BBC: The tusk was found close to the ancient footprints site