One detailed field measured section A1 of 74 m thick selected out of 29 measured sections along 130 km distance to represent the Miocene Ar-Rajmah Group carbonate sequence in Cyrenaica, northeast Libya. It was sampled every 0.5 m for XRF trace and common elements analysis, whole rock stable isotope (δ¹⁸O, δ¹³C) chemostratigraphy, and thin sections petrographic analysis.

The Ar-Rajmah Group carbon isotope data indicates this unit preserves a record of almost the entire Miocene. The Cyrenaican Miocene carbonate succession is made up of two shallowing upward 2^nd-order supersequences (SS1–SS2) that comprise six main 3^rd-order sequences (S1–S6).

The XRF measured Ca wt% curve indicates three intervals of pronounced CaCO₃ dissolution occurred: (1) within the Early Miocene coinciding with the flooding surface of 3^rd-order sequence 1, (2) above the Early-Middle Miocene boundary, within the TST of the 2^nd-order supersequence 2, and within the transgressive system tract of 3^rd-order sequence 3, and (3) below the Middle-Late Miocene boundary, within the maximum flooding zone of the 2^nd-order supersequences 2, and between 3^rd-order sequences S3 and S4. These dissolution events are associated with positive excursions in the carbon isotope, and major transgressive events. In addition, in the Cyrenaican Miocene carbonate rocks there is a significant negative correlation between the CaCO₃ amount and the δ¹⁸O values that might be related to the fluctuations in the siliciclastic influx. 

The early Middle Miocene and late Middle Miocene CaCO₃ dissolution events are global and recognized worldwide, whereas the Early Miocene CaCO₃ dissolution event is local and recognized only in the Cyrenaican carbonate succession. All these dissolution events occurred in high porosity zones, based on thin sections petrographic analysis of the Cyrenaican carbonate rocks.