On Gökçeada Island, the Mezardere Formation is dominated by the prodelta facies composed mostly of light grey, thinly bedded, fissile calcareous mudstones and siltstones, which mostly display parallel lamination or rarely ripple lamination. These sediments are intercalated with isolated thin beds of very fine- or fine-grained slightly muscovitic sandstones, which display parallel lamination in the lower part and ripple lamination in the upper part, or only ripple lamination. Thicker sandstone beds, referred to as mouth bars, are present in places. The prodelta sediments are poorly bioturbated (ii = 0–1), but moderately diverse trace fossils occur on some bedding surfaces, including 22 ichnotaxa referred to 13 ichnogenera and three trace fossils left in open nomenclature. The impoverished trace fossil assemblages are typical of deltaic sediments, but paucity of the trace fossils and poor bioturbation of the prodelta sediments in the Mezardere Formation is striking. The typically marine ichnoataxa are rare or absent in most outcrops. This trace fossil assemblage, resembling the Mermia ichnofacies, suggests a strong brackishness of the palaeoenvironment; however, the occurrence of Bichordites kuzunensis in one outcrop suggests local and temporal normal marine conditions referred to as salinity fluctuations.

中文翻译：

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土耳其西部 Gökçeada 岛 Mezardere 组（晚始新世 - 早渐新世）前三角洲沉积物的地质学

在 Gökçeada 岛，Mezardere 组以前三角洲相为主，主要由浅灰色、薄层、易裂变的钙质泥岩和粉砂岩组成，多呈平行层理或很少呈波纹状层理。这些沉积物夹有孤立的极细粒或细粒略带白云母砂岩的薄层，下部呈平行层理，上部呈波纹状层状，或仅呈波纹状层状。一些地方存在较厚的砂岩层，称为口坝。前三角洲沉积物的生物扰动较差（ii = 0-1），但在一些层理表面出现了适度多样的痕量化石，包括 22 种鱼类目（指 13 种鱼属）和 3 种残留在开放命名法中的痕量化石。贫瘠的痕迹化石组合是典型的三角洲沉积物，但是，Mezardere 组中前三角洲沉积物的踪迹化石稀少和生物扰动差是惊人的。在大多数露头中，典型的海洋 ichnoataxa 很少见或不存在。这种类似于 Mermia 地相的痕迹化石组合表明古环境具有强烈的微咸性；然而，在一个露头中发现 Bichordites kuzunensis 表明当地和时间正常的海洋条件被称为盐度波动。