The conglomerate grades into laminated greenish/dark grey mudstone at a horizon approximately 87 m above the base through sandstone.
At lower frequencies, therefore, induced perceived temporal modulation occurred between a reddish and greenish percept.
In the blue-green region the eccentric test patch is seen as more blue than the probe and has to be rotated in a greenish direction.
Second, note that the inducing bars replaced some of the light in the purplish and greenish surrounding stripes.
On the horizontal axis "reddish" is positive and "greenish" is negative; on the ver tical axis bright is positive and dim is negative.
A particularly fine specimen is a small anthropomorphic figurine pendant, sculpted in a soft greenish sandstone.
Furthermore, our trichromatic system may have evolved to allow the detection of brownish-reddish edibles against greenish backgrounds.
This material consists of two main components, which are greenish and dark grey, respectively.
