In the core sample collected from Yellowstone which layer is the cyanobacteria?

In the core sample collected from Yellowstone, the layer containing cyanobacteria is typically found in the microbial mats or the uppermost layers of sediment. These mats are formed by communities of cyanobacteria and other microorganisms that thrive in the warm, nutrient-rich waters of hot springs. The presence of cyanobacteria is crucial for the ecosystem, as they contribute to primary production and nutrient cycling in these geothermal environments.