Stromatolites are the layered trace fossils of microbial life, primarily cyanobacteria. Some of them date back an astounding 3.4 billion years, making them the oldest record of life on planet Earth. Stromatolites and Microbialites were typically formed in shallow water by the growth of layer upon layer of cyanobacteria, a single-celled, photosynthesizing microbe. These layers often form very beautiful, and colorful banded structures in the rock.
These oxygen producing cyanobacteria, while so simple they even lacked DNA were responsible for possibly the largest changes the earth has undergone as they were the only major source of atmospheric oxygen critical for the development of more complex life.
Christmas is rapidly approaching. For US customers there is still time to place orders and have them arrive in time for x-mas. For International customers only expensive, expedited shipping methods will be able to get them there in time.
While we are continuing to get most orders shipped out within 1-2 business days we CANNOT guarantee any delivery times. Delivery delays are very common this time of year as shipping volumes increase. We have no control over these delays.
The dates below are the cutoffs based on carrier provided transit times.
UPS Ground: Friday, Dec 14th
USPS First Class: Tuesday, Dec 18th
USPS Priority: Wednesday, Dec 19th
UPSP Priority Express: Thursday, Dec 20th
These are based on all US locations, it may be possible to receive shipments faster to areas of the country closer to our warehouse in Washington State. Please contact us if you have any questions.