Serious geologists and paleontologists usually make microscopic preparations of their rocks to determine the microstructures and mineral and/or fossil content. How about thin sections and polished sections?

Dear Dr Grundmann

you are absolutely right, I am still in the field, the rock unit I came across the other day was not mapped and its stratigraphic position is yet unclear to me, we took samples for thin section study, meanwhile I was looking for any possible suggestions about the age and nature of this rock. Its deformation apparently suggests some grades of metamorphism as well, you have certainly came across similar deformation in the rocks of this type in your field observations, I would be thankful to have your opinion on that.

Mit Herzlichen Grüßen

Hesam

I agree with Guenter Grundmann . It's bad practice to make conclusions about minerals or rocks based on a photo (from a phone camera? in the sunlight). There should be data to analyse. The location (coordinates NE), the thin section (CPL, PPL), the chip and so on...

For me Stramatolites should have a diagnostic roundish structures on them (a full circle). However, I, also, got suspicious about this sample. I agree with the previous answers to get a thin-section or so.