The examined interval of the March Point and Petit Jardin formations (total thickness ~130 m) spans the Middle−Upper Cambrian (lower Port au Port Group) at the Belle Isle Strait, western Newfoundland. The deposits consist of dolomitized shallow-water carbonates ranging from microbial mudstones to oolitic grainstones. A multi-technique evaluation proved the petrographic and geochemical preservation of the investigated micritic carbonates. The δ¹³C and δ¹⁸O values (−1.2 ± 1.1‰ VPDB and −6.7 ± 1.3‰ VPDB, respectively) exhibit an insignificant correlation (R² = 0.16) and similarly the δ¹³C values with their Mn/Sr ratio (R² = 0.01). This supports the preservation of at least near-primary δ¹³C signatures that can be utilized to construct a high-resolution δ¹³C profile for reliable global correlations. The δ¹³C profile exhibits two major negative excursions, the lower excursion (~4‰) immediately below the lower boundary of the March Point Formation (Hawke Bay/March Point boundary) and the upper excursion (~2‰) almost at the lower boundary of the Petit Jardin Formation where these excursions are likely associated with short-term sealevel changes. The trilobite biozonation scheme suggests the correlation of the lower excursion with the DICE (Drumian Carbon Isotope Excursion) event and the upper excursion with the base of the SPICE (Steptoean Positive Carbon Isotope Excursion) counterpart and both events have been globally documented on different paleocontinents.

进行中的March Point和Petit Jardin地层的间隔（总厚度〜130 m）跨越了纽芬兰西部Belle Isle海峡的中上寒武统（Port Port au Port Group）。矿床由白云石化的浅水碳酸盐组成，范围从微生物泥岩到鲕粒岩。一项多技术评估证明了所研究的微粉碳酸盐岩的岩石学和地球化学保存。的δ ¹³ C和δ ^18个O值（-1.2±1.1‰VPDB和-6.7±1.3‰VPDB，分别地）表现出insigni着的相关性（R ²  = 0.16），并且类似地δ ¹³与它们的Mn / Sr比值C值（ R ²  = 0.01）。这支持至少接近初级δ的保存¹³可以用来构建一个高C号决议的签名δ ¹³ C ^廓为可靠的全球相关性。的δ ¹³ C型具有两个主要负偏移，下偏移（〜4‰）正下方的三月点形成的下边界（霍克湾/三月点边界）和上偏移（〜2‰）几乎在下部Petit Jardin组的边界，这些偏移可能与短期海平面变化有关。三叶虫的生物区划方案表明，较低的偏移与DICE（德拉姆碳同位素偏移）事件的相关性和较高的偏移与SPICE（斯蒂芬斯阳性碳同位素偏移）对应物的基准的相关性，并且这两个事件已在不同的古大陆上得到了全面的记录。