The Burgess Shale fossils were created at a time when the future Canadian land mass was situated near the Earth’s equator. The creatures were preserved when an entire marine ecosystem was buried in mud that eventually hardened and became exposed hundreds of millions of years later in an outcrop...
The fossil beds are in a series of shale layers, averaging 30 millimetres (1.2 in) and totalling about 160 metres (520 ft) in thickness. These layers were deposited against the face of a high undersea limestone cliff. All these features were later raised up 2,500 metres (8,000 ft) ...
An unusual feature of the Burgess Shale is that it is one of the earliest fossil beds to contain impressions of the soft parts of animals.───吉斯叶岩不同寻常的特质在于,它是保存有生物软体结构的最古老化石。 In an area of the Atlas Mountains of Morocco the researchers have found another ...
Burgess Shale Medical Encyclopedia Wikipedia Related to Burgess Shale:Cambrian Explosion Burgess Shale A rock formation in the western Canadian Rockies containing a wealth of fossilized invertebrates of the early Cambrian Period that were buried by an underwater avalanche of fine silt, preserving many de...
1Paragraph 7: Fossil formations like the Burgess Shale show that evolution cannot always be thought of as a slow progression. The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals. Why was this evolution so rapid? No one really knows....
However, it has also become evident that Burgess Shale-type preservation is affected by a complex combination of biotic (e.g. gut bacteria, body wall composition, mode of life) and abiotic (e.g. sediment mineralogy, anoxia, transport) conditions that result in different degrees of fossil ...
The Cambrian Burgess Shale-type biotas form a globally consistent ecosystem, usually dominated by arthropods. Elements of these communities continued into the Early Ordovician at high latitude, but our understanding of ecological changes during the Great
Burgess ShaleThe Burgess Shale, a set of fossil beds containing the exquisitely preserved remains of marine invertebrate organisms from shortly after the Cambrian explosion, was discovered in 1909, and first brought to widespread popular attention by Stephen Jay Gould in his 1989 bestseller Wonderful ...
The Burgess Shale Fossil Beds in Yoho National Park offer Science 20 students an opportunity to learn about geologic processes, the history of life on earth, and the rich heritage of a precious landscape. By exploring the fossil beds themselves and their surrounding environs in a cross-...
The geometry of the basin, the sedimentologic characteristics of the beds, as well as taphonomic trends in the fossil assemblages were utilized to critically assess the various depositional scenarios postulated for the Burgess Shale. The majority of soft-bodied fossils are entombed within many of ...