Lower Cambrian


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Related to Lower Cambrian: Upper Cambrian

Lower Cambrian

[′lō·ər ′kam·brē·ən]
(geology)
The earliest epoch of the Cambrian period of geologic time, ending about 540,000,000 years ago.
References in periodicals archive ?
1997, Arthropods of the Lower Cambrian Chengjiang fauna, southwest China: Fossils and Strata, v.
Lower Cambrian (Branchian) trilobites and biostratigraphy of the Hanford Brook Formation, southern New Brunswick.
Relevant data on the northern part are absent but, in all likelihood, the valley reaches the Lower Cambrian terrigeneous rocks.
Numerous drillcores, however, confirm the subsurface presence of siltstone/sandstone-dominant Ediacaran rocks (Kotlin Regional Stage) overlain by the Lower Cambrian Lontova and Lukati formations.
According to their report, lower Cambrian (Cambrian Series 2) strata that crop out around the Dahuoluo Well consist of greyish-white and white biosparites, occasionally with black chert interbeds.
In the Laisvall-Storuman region (northern Sweden), approximately 400 km south of the study area in Finland, the trilobite-bearing Lower Cambrian sequence has been convincingly proved by new palaeontological data obtained from the overlying rocks.
The claim is underlain by stratified rocks of the Lower Cambrian Series, straddling the Laib and Reno formations, which has been intruded by a variety of granitic rocks.
The genus is represented by three species that have been reported from the Lower Cambrian of the East European Craton (Kirjanov 1968; Aren & Lendzion 1978) and from the western North American Craton (Signor & McMenamin 1988; Hagadorn & Waggoner 2000).
The belt is defined by a collision suture zone dominated by Lower Cambrian carbonate-volcanogenic schist and ophiolite complexes.