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We searched for shocked carbon chain chemistry (SCCC) sources with C$_3$Sabundances surpassing those of HC$_5$N towards the dark cloud L1251, using theEffelsberg telescope at K-band (18 -- 26\,GHz). L1251-1 and L1251-3 areidentified as the most promising SCCC sources. The two sources harbor youngstellar objects. We conducted mapping observations towards L1251-A, the westerntail of L1251, at $\lambda$ $\sim$3\,mm with the PMO 13.7 m and the NRO 45 mtelescopes in lines of C$_2$H, N$_2$H$^+$, CS, HCO$^+$, SO, HC$_3$N andC$^{18}$O as well as in CO 3--2 using the JCMT. The spectral data were combinedwith archival data including Spitzer and Herschel continuum maps for furtheranalysis. Filamentary sub-structures labeled as F1 to F6 were extracted inL1251, with F1 being associated with L1251-A hosting L1251-1. The peakpositions of dense gas traced by HCO$^+$ are misaligned relative to those ofthe dust clumps. Episodic outflows are common in this region. The twistedmorphology of F1 and velocity distribution along L1251-A may originate fromstellar feedback. SCCC in L1251-1 may have been caused by outflow activitiesoriginated from the infrared source IRS1. The signposts of ongoing SCCC and thebroadened line widths of C$_3$S and C$_4$H in L1251-1 as well as thedistribution of HC$_3$N are also related to outflow activities in this region.L1251-1 (IRS1) together with the previously identified SCCC source IRS3demonstrate that L1251-A is an excellent region to study shocked carbon chainchemistry.

A search for cloud cores affected by shocked carbon chain chemistry in L1251