Cyanobacteria and Oxygen. Stromatolites are created by cyanobacteria, also called blue-green algae. These microscopic life forms are not really algae at all but bacteria that have the ability to carry out photosynthesis.It is the process of photosynthesis combined with the growth of the cyanobacteria that creates the distinctive dome-shaped, finely layered rocks we call stromatolites.his was transformed because cyanobacteria could photosynthesize to make its food. The process of photosynthesis uses carbon dioxide and produces oxygen as a byproduct. Billions of cyanobacteria producing oxygen, constantly, over many millions of years made an atmosphere that could support life as we know it.
Sequence Boundary. The sequence boundary is an unconformity updip and a correlative conformity downdip. Where it is an unconformity, it is a surface of subaerial exposure and erosion; however, the expression of those features in an individual outcrop may or may not be obvious.he transgressive surface represents the first major flooding surface to follow the sequence boundary and is usually distinct from the relatively minor flooding surfaces that separate parasequences in the lowstand systems tract.
A sequence is simply an ordered list of numbers or terms. A series is the sum of a sequence. A sequence is an ordered list of numbers or terms. It can contain elements, numbers and terms and can be a limited set or an infinite set. Unlike in a set, order in a sequence has grave importance. It is known as a discrete function. For example [1, 2, 3, 4â¦] is a sequence or progression (in the UK). There are two types of sequence an arithmetic sequence and a geometric sequence. An arithmetic sequence is a sequence in which the difference between two consecutive terms remains constant, known as common difference.