WebRelationships and boundaries: Unconformably overlies early Middle Cambrian Thorntonia Limestone (Narpa Group) in Undilla Sub-basin. Unconformably overlies Early Cambrian … Web21 3 Thorntonia Limestone, Australia, some of the youngest Cambrian strata to display 22 exceptional phosphatic preservation of small shelly fossils. We find that within 23 Thorntonia sediments, phosphate was remobilized by organic decay and bacterial 24 iron reduction, with subsequent reprecipitation largely as apatite within the
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WebJun 1, 2014 · Small shelly fossils are preserved as apatite steinkerns in the Cambrian Series 2–3 Thorntonia Limestone, Australia. Petrological observations indicate that phosphorus … Websedimentary rocks on top of the currently exposed Thorntonia Limestone at the time of impact. The exposed annulus is remarkably well preserved, with preservation attributed to postimpact sedimentation. The LHIS has an atypical crater morphology with no central uplift. The heterogeneous target materials at Lawn Hill were probably low-strength ... WebThe asymmetry of the width of the limestone annulus and the disposition of rocks within the central uplift may be due to preimpact structure, and/or a component of oblique impact. Age of Impact: The contorted nature of the Thorntonia limestone in the limestone annulus unequivocally constrains the impact age to synpost middle to late Cambrian [2]. f3400cg