Figure 1.

Transmission electron micrograph (TEM) image of resin-embedded, ultrathin-section of fine-grained sediment from the Bay of St. Louis, Mississippi. The fabric is characteristically porous, as the light grey color indicates pore space, now replaced by resin. Dark features represent clay mineral particles (domains) and heavy metal-stained organic matter. Bright areas are thin sectioning artifacts (i.e., holes after mineral grains were plucked out during thin-sectioning.)