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A dark mud that is rich in organic nutrients and oxygen and has accumulated at the bottom of a marsh or lake.

[Swedish gyttja, mud, ooze; see gheu- in Indo-European roots.]


(Geological Science) geology a deposit full of nutrients that is found at the bottom of a body of water


(ˈyɪt tʃɑ)

a mud rich in organic matter found at the bottom or near the shore of certain lakes.
[1885–90; < Swedish]
References in periodicals archive ?
After the decline of the Baltic Ice Lake lacustrine sediments (lime and gyttja up to 1 m in thickness) were deposited into the Varudi depression, followed by peat accumulation in the Holocene (Suuroja et al.
It was made on a gyttja bulk sample taken from a borehole which was situated 740 m NW from the Palanga site (Fig.
2009), including clay at the bottom of the sequence, followed by a transition to a more organic gyttja.
The percussion coring of the basin further showed that coarse diamicton is overlain by coarse, granite-rich, moderately sorted sediment which, in turn, is overlain by alternating layers of gyttja and wetland sediment.
Algal gyttja deposition initially occurred in the third bog and then was followed by marl deposition.
The analysed sediments consisted of brownish gyttja of high organic matter content (loss-of-ignition (LOI) 60-86%) and high porosity (95-98% of water).
In buried conditions patches of peat and gyttja were sealed and preserved up to the present, offering material for radiocarbon dating.
Stratigraphy: Characteristic of limnic sediments, in silt, clay, gyttja, and marl.
Surficial organic deposits are not common on the Ohio till plain; however, three houses in the north Columbus neighborhood of Sharon Woods had to be leveled owing to structural damage from sinking into peat and gyttja.