And here (ahem) here we see the STRA-tam of the distinguishable ages of the brick.
That is to say internally consistent characteristics (i.e. color, texture, TASTE) that distinguishes it from contiguous layers. Individual bands may vary in thickness from a few millimeters to a kilometer or more. Each band represents a specific mode of brickmologly (the Portuguese call this Tijology, which some might find easier to say or remember, this will get you extra credit on the final exam) wherewithall the brick, being exposed to variances in silt, hydrogenation, virgin blood, and/or high level doses of travieso radiación can cause the brick matter to blush more and more of a “brick color” as shown here.
No, TRA-vieso, with a “T”.
Looking to this fine photograph, we see many distinct beds. We have the gravel at the bottom, which of course is what all brick aspires to be, without form or color. It is released from the confines of brickdom and at last can evolve to the higher state of rock…which is concrete! “Blessed o fabricante do misturador!”