Due to constant southwards regression and infilling
of the BSB, the lagoonal-littoral facies became increasingly
dominant all over Saaremaa towards the end of Wenlock. At that time, the shoal facies only reached Saaremaa during short transgressions. A series of upwards shallowing cycles with shoal to lagoonallittoral
sediments, often bracketed by discontinuity surfaces, therefore characterizes the Jaagarahu and Rootsiküla stages on Saaremaa