Here, we provide a detailed facies and depositional record from a NE-SW-directed, 250-km-long transect across a distally steepened, Middle Jurassic carbonate ramp in the northern Tethyan realm (Iran). Among the six main facies types described, two stand out because of their beyond-regional significance: (i) Middle Callovian microbial and microbial-skeletal mounds embedded in muddy intermound sediment and (ii) Upper Callovian conglomeratic debris-flow deposits truncating the mound unit. The mound features described here did not evolve into reefal structures and evidence for a framestone structure is lacking. They occur as low-relief, mud-dominated domical structures (a few metres wide). The development of the Middle Callovian mounds is perhaps best linked to a period of minimum sedimentation rates and sufficient accommodation space resulting from a long-term gradual sea-level rise commencing in the Late Bajocian. With respect to the Upper Callovian conglomeratic deposits overlying the mound interval, the absence of sedimentary structures such as grading, the nature of the sub-angular or rounded clasts and the very poor sorting are indicative of a catastrophic debris flow origin. Based on data compiled here, the conglomeratic deposits likely formed due to relative sea-level fall inducing the reworking of mound facies by the lowered wave base and currents, and basinward transport of reworked material to the distal outer ramp. Our findings are compared with coeval deposits from the western Tethyan domain and placed into a process-oriented context. The described northern Tethyan Late Bajocian to Middle Callovian deepening-upward trend, followed by relative sea-level fall in the Late Callovian near the Middle-Late Jurassic transition, is in agreement with observations from other coeval Tethyan basins/platforms. Data shown here have wider relevance for workers concerned with the Jurassic evolution of the Tethyan Ocean in general and shed light on the intricate relation of changes in accommodation space and ramp architecture.

在这里，我们提供了一个由NE-SW引导的250公里长的样带的详细相和沉积记录，该样带横跨北部特提斯地区（伊朗）的一个远端陡峭的中侏罗统碳酸盐岩斜坡。在所描述的六种主要相类型中，有两种因其区域外意义而脱颖而出：（i）埋在泥泞的层间沉积物中的中卡洛维微生物和微生物骨骼丘，以及（ii）截去丘单元的上卡洛维砾岩泥石流沉积物。这里描述的丘陵特征并没有演变成珊瑚礁结构，也缺少框架结构的证据。它们以低浮雕，以泥浆为主的球形结构（几米宽）出现。巴约西亚晚期开始的长期逐渐海平面上升导致中卡洛维丘陵的发展可能与最低沉积率时期和足够的居住空间有关。关于覆盖在土丘间隔上的上卡洛夫砾岩沉积物，不存在诸如坡度之类的沉积结构，亚角或圆形碎屑的性质以及非常差的分类，这表明灾难性泥石流起源。根据此处收集的数据，可能由于相对海平面下降而形成的砾岩沉积物，会导致波基和洋流降低，从而导致丘相的返工，以及返工材料向下游外坡道的向底运输。将我们的发现与来自西部特提斯地区的同代沉积物进行比较，并将其置于面向过程的环境中。所描述的北部特提斯人晚巴约西亚至卡洛夫中部的加深趋势，随后在晚侏罗纪过渡期附近的卡洛夫晚期海平面相对下降，这与其他中世纪特提斯盆地/平台的观测结果一致。此处显示的数据对与一般的特提斯洋的侏罗纪演化有关的工作者具有更广泛的相关性，并阐明了居住空间和坡道建筑变化之间的复杂关系。与其他中世纪特提斯盆地/平台的观测结果一致。此处显示的数据对与一般的特提斯洋的侏罗纪演化有关的工作者具有更广泛的相关性，并阐明了居住空间和坡道建筑变化之间的复杂关系。与其他中世纪特提斯盆地/平台的观测结果一致。此处显示的数据对与一般的特提斯洋的侏罗纪演化有关的工作者具有更广泛的相关性，并阐明了居住空间和坡道建筑变化之间的复杂关系。