1. n. [Geology]
Structures formed by sediment injection. Because they resemble intrusive and extrusive igneous features, much of the vocabulary for describing injectites, or clastic intrusions, comes from igneous geology. Sills are emplaced parallel to bedding, whereas dikes cut through bedding. The strata containing the intrusion are called host strata and the layers that feed the intrusion are the parent beds. Sand-injection features exhibit size scales from millimeters to kilometers, and have been seen in cores, borehole image logs, seismic sections, outcrops, aerial photographs and satellite images.
Alternate Form: clastic intrusion