Here are the top 12 food sources of zinc, although keep in mind the absorption rate of zinc is best from foods that donât contain any nutrients, which are usually animal-based as opposed to plant-based (percentages below are based on the average adult womenâs RDI of 8 milligrams/day):
A stromatolite (literally, âlayered rockâ) is a solid structure created by single-celled microbes called cyanobacteria (blue-green algae). The cyanobacteria form colonies and trap sediment with their sticky surface coatings.The trapped sediment reacts to calcium carbonate in the water to form limestone. These limestone deposits build up very slowly â it can take a stromatolite 100 years to grow 5 cm.A 1 m-high stromatolite might be 2,000 years old!he cyanobacteria form colonies and trap sediment with their sticky surface coatings. The trapped sediment reacts to calcium carbonate in the water to form limestone. These limestone deposits build up very slowly â it can take a stromatolite 100 years to grow 5 cm. A 1 m-high stromatolite might be 2,000 years old!
Stromatolite fossils are evidence of the earliest life on the earth. Western Australia perhaps has the best stromatolite fossils, giving a record through the eons of time. Fossils of the earliest known stromatolites, about 3.5 billion years old, are to be found near Marble Bar in the Pilbara. Hamelin Pool gives an indication of what the earth may have looked like 3.5 billion years ago when stromatolites were widespread.