“…As a result, near-surface occurring lithics would dominate the base of the ejecta rings, while lithics originating from deep-seated explosions location will be deposited on the upper parts of the ejecta ring. Many authors, however, have interpreted the variations in grain size and component distributions in tephra deposits of maars to reflect variations in the intensity of fragmentation during the phreatomagmatic explosions and/or intervening magmatic volatile-driven phases (e.g., [11,20,74,142]) which in turn are often inferred to be related to magma-water ratios (e.g., [143]). It has thus been observed that some maars record intermediate and/or closing phases of magmatic volatile-driven activity in the form of lavas and/or scoria accumulations (e.g., Barombi Koto Maar [23], Tecuitlapa Maar [28]) which are interpreted to result from the absence of groundwater according to [8].…”