Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'protomatrix'?

A. A type of matrix consisting of un-recrystallized detrital clayey lutum (clay fraction, less than 2 micron) in weakly consolidated rocks.
B. A type of matrix consisting of soft deformable framework grains that are squeezed and flattened between stronger framework grains.
C. A type of matrix consisting of recrystallized detrital lutum (clay fraction, less than 2 micron) or protomatrix.
D. A type of matrix consisting of inhomogeneous interstitial materials grown in originally open interstices during diagenesis, but lacking the homogeneity and clear textural evidence of pore-filling needed to classify as phyllosilicate cement.

Answer: A type of matrix consisting of un-recrystallized detrital clayey lutum (clay fraction, less than 2 micron) in weakly consolidated rocks.