Their matrix is calcareous foraminiferous marl with some specks of iron oxide and small to noticeable quantities of basalt-derived silt-sized minerals, like olivine and plagioclase. The identifiable foraminifera dates to the Paleocene Epoch. The sand-size non-plastic inclusions compose <5–20% of the volume of each sherd (Table 1) and comprise dominantly quartz and basalt (Fig. 3). The quartz grains are rounded to sub-angular very fine to medium sand size (i.e. 0.05–0.4 mm) and are evenly distributed within the matrix. The basalt is alkali-olivine and eroded, with olivine altered to iddingsite. The basalt grains range from fine-sand to medium-pebble size (i.e. 0.5–8.0 mm), most of them are rounded to sub-rounded an...
Their matrix is calcareous foraminiferous marl with some specks of iron oxide and small to noticeable quantities of basalt-derived silt-sized minerals, like olivine and plagioclase. The identifiable foraminifera dates to the Paleocene Epoch. The sand-size non-plastic inclusions compose <5–20% of the volume of each sherd (Table 1) and comprise dominantly quartz and basalt (Fig. 3). The quartz grains are rounded to sub-angular very fine to medium sand size (i.e. 0.05–0.4 mm) a...
