I believe it is "Bacilli" because the question give you a hint by saying "<span>rod shaped structures", Bacilli very similar to this description.
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Geologists can 'read' rock layers using relative and absolute dating techniques. ... Relative dating arranges geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy (the rock layers are called strata).
Spectirin - structure function and disease