季候泥 （英語：varve ）是沉積物或沉積岩的年度層，是韻律石（rhythmites）的一種。最初季候泥指的是在冰川湖沉積物中單一年度層的沉積物，但在 1910 年地質大會上，瑞典地質學家 Gerard De Geer（1858-1943）提出了一個新的定義，包括任何沉積物在一年度的沉積層[ 1] [ 2] [ 3]
更新世季候泥。地點：Scarborough Bluffs，Toronto，安大略州，加拿大. 每層季候泥厚大於半英寸 年度層的沉積很明顯的原因是，因為在春季水流強度較大，水流所繫帶的顆粒比其它季節所繫帶的顆粒要粗得多。因此每個年度週期就形成了一對粗的和細的兩個層理[ 4] [ 5]
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